feat Create skeletal mesh

23 files changed, 1701 insertions, 159 deletions

diff --git a/src/vk/model_instance.hpp b/src/vk/animation.cpp
index 1383737..fec038e 100644
--- a/src/vk/model_instance.hpp
+++ b/src/vk/animation.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,19 +14,14 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_VK_MODEL_INSTANCE_H
-#define CANDY_GEAR_VK_MODEL_INSTANCE_H 1
-
-#include "core.hpp"
+#include "animation.hpp"
 
 namespace VK
 {
 
-struct ModelInstance
+Bone::Bone(glm::mat4 offset_matrix):
+  offset_matrix{offset_matrix}
 {
-  glm::vec3 position, rotation;
-};
-
 }
 
-#endif /* CANDY_GEAR_VK_MODEL_INSTANCE_H */
+}
diff --git a/src/vk/animation.hpp b/src/vk/animation.hpp
new file mode 100644
index 0000000..46dd5bc
--- /dev/null
+++ b/src/vk/animation.hpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_VK_ANIMATION_H
+#define CANDY_GEAR_VK_ANIMATION_H 1
+
+#include <vector>
+
+#include "core.hpp"
+#include "animation/frame.hpp"
+
+namespace VK
+{
+
+struct Bone
+{
+  glm::mat4x4 offset_matrix;
+
+  Bone(glm::mat4 offset_matrix);
+};
+
+struct BoneTransform
+{
+  uint32_t bone_id;
+  Channel<glm::vec3> positions;
+  Channel<glm::quat> rotations;
+  Channel<glm::vec3> scales;
+};
+
+struct Animation
+{
+  std::vector<BoneTransform> bone_transforms;
+  float final_time;
+};
+
+}
+
+#endif /* CANDY_GEAR_VK_ANIMATION_H */
diff --git a/src/vk/animation/frame.hpp b/src/vk/animation/frame.hpp
new file mode 100644
index 0000000..953a6a6
--- /dev/null
+++ b/src/vk/animation/frame.hpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_VK_FRAME_H
+#define CANDY_GEAR_VK_FRAME_H 1
+
+#include <vector>
+
+#include "../core.hpp"
+
+namespace VK
+{
+
+template<typename T>
+struct Frame
+{
+  const T value;
+  const float timestamp;
+
+  Frame(T value, float timestamp):
+  value{value},
+  timestamp{timestamp}
+  {
+  }
+
+};
+
+template<typename T>
+struct Channel
+{
+  int current_index{0};
+  std::vector<Frame<T>> key_frames;
+
+  inline glm::mat4
+  interpolate(
+    float animation_time,
+    glm::mat4 (*single_frame)(T frame),
+    glm::mat4 (*multiple_frames)(T current_frame, T next_frame, float scale))
+  {
+    if(this->key_frames.size() == 1)
+      return single_frame(this->key_frames[0].value);
+    else
+    {
+      while(animation_time > this->key_frames[current_index].timestamp)
+        this->current_index++;
+
+      float scale_factor;
+      Frame<T> *previous_frame;
+      Frame<T> *next_frame{&(this->key_frames[this->current_index])};
+      if(this->current_index == 0)
+      {
+	previous_frame = &(this->key_frames[this->key_frames.size() - 1]);
+        float midway_length{animation_time - 0};
+        float frames_diff{next_frame->timestamp - 0};
+        scale_factor = midway_length / frames_diff;
+      }
+      else
+      {
+	previous_frame = &(this->key_frames[this->current_index - 1]);
+        float midway_length{animation_time - previous_frame->timestamp};
+        float frames_diff{next_frame->timestamp - previous_frame->timestamp};
+        scale_factor = midway_length / frames_diff;
+      }
+
+      return multiple_frames(
+	previous_frame->value, next_frame->value, scale_factor);
+    }
+  };
+};
+
+}
+#endif /* CANDY_GEAR_VK_FRAME_H */
diff --git a/src/vk/core.hpp b/src/vk/core.hpp
index 6d42bde..64d1431 100644
--- a/src/vk/core.hpp
+++ b/src/vk/core.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,8 +23,9 @@
 #define GLM_FORCE_DEPTH_ZERO_TO_ONE
 
 #include <glm/ext/vector_float3.hpp>
-#include <glm/glm.hpp>
+#include <glm/ext.hpp>
 #include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtx/quaternion.hpp>
 #include <glm/vec3.hpp>
 
 #include <vulkan/vulkan.h>
diff --git a/src/vk/graphics_pipeline_3d.cpp b/src/vk/graphics_pipeline_3d.cpp
index 4eacc9d..6639d99 100644
--- a/src/vk/graphics_pipeline_3d.cpp
+++ b/src/vk/graphics_pipeline_3d.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,7 +22,7 @@
 #include "../core.hpp"
 #include "core.hpp"
 #include "image.hpp"
-#include "vertex_3d.hpp"
+#include "static_mesh_vertex.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
@@ -330,7 +330,7 @@ load_pipeline(void *obj)
 
   VkVertexInputBindingDescription vertex_input_binding{};
   vertex_input_binding.binding = 0;
-  vertex_input_binding.stride = sizeof(VK::Vertex3D);
+  vertex_input_binding.stride = sizeof(VK::StaticMeshVertex);
   vertex_input_binding.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
 
   std::array<VkVertexInputAttributeDescription, 3> vertex_attribute{};
@@ -338,17 +338,17 @@ load_pipeline(void *obj)
   vertex_attribute[0].location = 0;
   vertex_attribute[0].binding = 0;
   vertex_attribute[0].format = VK_FORMAT_R32G32B32_SFLOAT;
-  vertex_attribute[0].offset = offsetof(VK::Vertex3D, position);
+  vertex_attribute[0].offset = offsetof(VK::StaticMeshVertex, position);
   // Normal.
   vertex_attribute[1].location = 1;
   vertex_attribute[1].binding = 0;
   vertex_attribute[1].format = VK_FORMAT_R32G32B32_SFLOAT;
-  vertex_attribute[1].offset = offsetof(VK::Vertex3D, normal);
+  vertex_attribute[1].offset = offsetof(VK::StaticMeshVertex, normal);
   // Texture coordinate.
   vertex_attribute[2].location = 2;
   vertex_attribute[2].binding = 0;
   vertex_attribute[2].format = VK_FORMAT_R32G32_SFLOAT;
-  vertex_attribute[2].offset = offsetof(VK::Vertex3D, texture_coord);
+  vertex_attribute[2].offset = offsetof(VK::StaticMeshVertex, texture_coord);
 
   VkPipelineVertexInputStateCreateInfo vertex_input_info = {};
   vertex_input_info.sType =
@@ -557,49 +557,48 @@ GraphicsPipeline3D::draw(
   }
 
   // Draw models
-  for(auto& [model, instances]:
-	cg_core.vk_renderer->models_to_draw[current_frame])
+  for(auto& [static_mesh, instances]:
+	cg_core.vk_renderer->static_models_to_draw[current_frame])
   {
-      std::array<VkDescriptorSet, 3> vk_descriptor_sets{
-	this->descriptor_sets_world[image_index],
-	view->descriptor_sets_3d[image_index],
-	model->descriptor_sets[image_index]};
-      VkBuffer vertex_buffers[]{model->mesh->vertex_buffer->buffer};
+      VkBuffer vertex_buffers[]{static_mesh->vertex_buffer->buffer};
       VkDeviceSize offsets[]{0};
 
-      vkCmdBindDescriptorSets(
-	draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
-	cg_core.vk_graphics_pipeline_3d_layout->pipeline, 0,
-	vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
       vkCmdBindPipeline(
 	draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
 	this->graphic_pipeline);
       vkCmdBindVertexBuffers(
 	draw_command_buffer, 0, 1, vertex_buffers, offsets);
       vkCmdBindIndexBuffer(
-	draw_command_buffer, model->mesh->index_buffer->buffer, 0,
+	draw_command_buffer, static_mesh->index_buffer->buffer, 0,
 	VK_INDEX_TYPE_UINT32);
 
       for(auto &instance: instances)
       { // Object matrix.
-        glm::mat4 instance_matrix{1.0f};
-        instance_matrix = glm::translate(
-          instance_matrix, instance.position);
-        instance_matrix = glm::rotate(
-          instance_matrix, instance.rotation.x, glm::vec3{1.0, 0.0, 0.0});
-        instance_matrix = glm::rotate(
-          instance_matrix, instance.rotation.y, glm::vec3{0.0, 1.0, 0.0});
-        instance_matrix = glm::rotate(
-          instance_matrix, instance.rotation.z, glm::vec3{0.0, 0.0, 1.0});
-
-        ODOModelInstance model_instance{instance_matrix};
-        vkCmdPushConstants(
-          draw_command_buffer,
-          cg_core.vk_graphics_pipeline_3d_layout->pipeline,
-          VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(ODOModelInstance),
-          &model_instance);
+        glm::mat4 base_matrix{1.0f};
+        base_matrix = glm::translate(base_matrix, *instance->position);
+        base_matrix = glm::rotate(
+          base_matrix, instance->rotation->x, glm::vec3{1.0, 0.0, 0.0});
+        base_matrix = glm::rotate(
+          base_matrix, instance->rotation->y, glm::vec3{0.0, 1.0, 0.0});
+        base_matrix = glm::rotate(
+          base_matrix, instance->rotation->z, glm::vec3{0.0, 0.0, 1.0});
+
+	std::array<VkDescriptorSet, 3> vk_descriptor_sets{
+	  this->descriptor_sets_world[image_index],
+	  view->descriptor_sets_3d[image_index],
+	  instance->descriptor_sets[image_index]};
+
+	vkCmdBindDescriptorSets(
+	  draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
+	  cg_core.vk_graphics_pipeline_3d_layout->pipeline, 0,
+	  vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
+
         vkCmdDrawIndexed(
-          draw_command_buffer, model->mesh->index_count, 1, 0, 0, 0);
+          draw_command_buffer, static_mesh->index_count, 1, 0, 0, 0);
+
+	VK::ODOStaticModel odo_static_model{};
+	odo_static_model.base_matrix = base_matrix;
+	instance->uniform_buffers[image_index].copy_data(&odo_static_model);
       }
   }
 
@@ -627,6 +626,7 @@ GraphicsPipeline3D::draw(
     view->ub_3d[image_index].copy_data(&ubo_view_3d);
   }
 
+  // TODO: Do not update this for each view. All views use the same data.
   { // Update world uniform buffer
     ODOWorld3D_Vert ubo_world_3d_vert{};
     ubo_world_3d_vert.ambient_light_color = glm::vec4{0.25, 0.25, 0.25, 1.0};
diff --git a/src/vk/graphics_pipeline_3d.hpp b/src/vk/graphics_pipeline_3d.hpp
index 925df77..d174b6e 100644
--- a/src/vk/graphics_pipeline_3d.hpp
+++ b/src/vk/graphics_pipeline_3d.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,8 +23,6 @@
 #include "../command.hpp"
 #include "core.hpp"
 #include "command_pool.hpp"
-#include "model.hpp"
-#include "model_instance.hpp"
 #include "uniform_buffer.hpp"
 #include "view_3d.hpp"
 
diff --git a/src/vk/graphics_pipeline_3d_layout.cpp b/src/vk/graphics_pipeline_3d_layout.cpp
index db5d210..cbb73e5 100644
--- a/src/vk/graphics_pipeline_3d_layout.cpp
+++ b/src/vk/graphics_pipeline_3d_layout.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -103,18 +103,64 @@ unload_descriptor_set_view(void *obj)
 }
 
 void
-load_descriptor_set_model_instance(void *obj)
+load_descriptor_set_skeletal_model(void *obj)
 {
   auto self = static_cast<VK::GraphicsPipeline3DLayout*>(obj);
 
-  std::array<VkDescriptorSetLayoutBinding, 1> layout_bindings{};
-
+  std::array<VkDescriptorSetLayoutBinding, 2> layout_bindings;
   layout_bindings[0].binding = 0;
-  layout_bindings[0].descriptorType =
+  layout_bindings[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+  layout_bindings[0].descriptorCount = 1;
+  layout_bindings[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
+  layout_bindings[0].pImmutableSamplers = nullptr;
+  layout_bindings[1].binding = 1;
+  layout_bindings[1].descriptorType =
     VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
+  layout_bindings[1].descriptorCount = 1;
+  layout_bindings[1].stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
+  layout_bindings[1].pImmutableSamplers = nullptr;
+
+  VkDescriptorSetLayoutCreateInfo layout_info{};
+  layout_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
+  layout_info.pNext = nullptr;
+  layout_info.flags = 0;
+  layout_info.bindingCount = static_cast<uint32_t>(layout_bindings.size());
+  layout_info.pBindings = layout_bindings.data();
+
+  if(vkCreateDescriptorSetLayout(
+       cg_core.vk_device_with_swapchain->device, &layout_info, nullptr,
+       &self->descriptor_set_skeletal_model) != VK_SUCCESS)
+    throw CommandError{
+      "Failed to create Vulkan descriptor set layout for model instance."};
+}
+
+void
+unload_descriptor_set_skeletal_model(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DLayout*>(obj);
+
+  vkDestroyDescriptorSetLayout(
+    cg_core.vk_device_with_swapchain->device,
+    self->descriptor_set_skeletal_model, nullptr);
+}
+
+void
+load_descriptor_set_static_model(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DLayout*>(obj);
+
+  std::array<VkDescriptorSetLayoutBinding, 2> layout_bindings;
+  layout_bindings[0].binding = 0;
+  layout_bindings[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
   layout_bindings[0].descriptorCount = 1;
-  layout_bindings[0].stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
+  layout_bindings[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
   layout_bindings[0].pImmutableSamplers = nullptr;
+  layout_bindings[1].binding = 1;
+  layout_bindings[1].descriptorType =
+    VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
+  layout_bindings[1].descriptorCount = 1;
+  layout_bindings[1].stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
+  layout_bindings[1].pImmutableSamplers = nullptr;
 
   VkDescriptorSetLayoutCreateInfo layout_info{};
   layout_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
@@ -125,19 +171,19 @@ load_descriptor_set_model_instance(void *obj)
 
   if(vkCreateDescriptorSetLayout(
        cg_core.vk_device_with_swapchain->device, &layout_info, nullptr,
-       &self->descriptor_set_model_instance) != VK_SUCCESS)
+       &self->descriptor_set_static_model) != VK_SUCCESS)
     throw CommandError{
       "Failed to create Vulkan descriptor set layout for model instance."};
 }
 
 void
-unload_descriptor_set_model_instance(void *obj)
+unload_descriptor_set_static_model(void *obj)
 {
   auto self = static_cast<VK::GraphicsPipeline3DLayout*>(obj);
 
   vkDestroyDescriptorSetLayout(
     cg_core.vk_device_with_swapchain->device,
-    self->descriptor_set_model_instance, nullptr);
+    self->descriptor_set_static_model, nullptr);
 }
 
 void
@@ -148,19 +194,14 @@ load_pipeline(void *obj)
   std::array<VkDescriptorSetLayout, 3> set_layouts{
     self->descriptor_set_world,
     self->descriptor_set_view,
-    self->descriptor_set_model_instance};
-
-  std::array<VkPushConstantRange, 1> push_constants;
-  push_constants[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
-  push_constants[0].offset = 0;
-  push_constants[0].size = sizeof(VK::ODOModelInstance);
+    self->descriptor_set_skeletal_model};
 
   VkPipelineLayoutCreateInfo pipeline_layout_info{};
   pipeline_layout_info.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
   pipeline_layout_info.setLayoutCount = set_layouts.size();
   pipeline_layout_info.pSetLayouts = set_layouts.data();
-  pipeline_layout_info.pushConstantRangeCount = push_constants.size();
-  pipeline_layout_info.pPushConstantRanges = push_constants.data();
+  pipeline_layout_info.pushConstantRangeCount = 0;
+  pipeline_layout_info.pPushConstantRanges = nullptr;
 
   if(vkCreatePipelineLayout(
        cg_core.vk_device_with_swapchain->device,
@@ -266,7 +307,8 @@ unload_render_pass(void *obj)
 const CommandChain loader{
   {&load_descriptor_set_world, &unload_descriptor_set_world},
   {&load_descriptor_set_view, &unload_descriptor_set_view},
-  {&load_descriptor_set_model_instance, &unload_descriptor_set_model_instance},
+  {&load_descriptor_set_skeletal_model, &unload_descriptor_set_skeletal_model},
+  {&load_descriptor_set_static_model, &unload_descriptor_set_static_model},
   {&load_pipeline, &unload_pipeline},
   {&load_render_pass, &unload_render_pass}
 };
diff --git a/src/vk/graphics_pipeline_3d_layout.hpp b/src/vk/graphics_pipeline_3d_layout.hpp
index 10c8bd9..cb89b95 100644
--- a/src/vk/graphics_pipeline_3d_layout.hpp
+++ b/src/vk/graphics_pipeline_3d_layout.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,7 +26,8 @@ struct GraphicsPipeline3DLayout
 {
   VkDescriptorSetLayout descriptor_set_world;
   VkDescriptorSetLayout descriptor_set_view;
-  VkDescriptorSetLayout descriptor_set_model_instance;
+  VkDescriptorSetLayout descriptor_set_skeletal_model;
+  VkDescriptorSetLayout descriptor_set_static_model;
   VkPipelineLayout pipeline;
   VkRenderPass render_pass;
 
diff --git a/src/vk/graphics_pipeline_3d_skeletal.cpp b/src/vk/graphics_pipeline_3d_skeletal.cpp
new file mode 100644
index 0000000..3e1db66
--- /dev/null
+++ b/src/vk/graphics_pipeline_3d_skeletal.cpp
@@ -0,0 +1,657 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "graphics_pipeline_3d.hpp"
+
+#include <array>
+#include <stdexcept>
+
+#include "../core.hpp"
+#include "core.hpp"
+#include "image.hpp"
+#include "skeletal_mesh_vertex.hpp"
+#include "uniform_data_object.hpp"
+
+namespace
+{
+
+void
+load_world_vert_uniform_buffer(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  try
+  {
+    self->ub_world_vert.reserve(cg_core.vk_swapchain->images_count);
+    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+      self->ub_world_vert.emplace_back(
+	cg_core.vk_device_with_swapchain, sizeof(VK::ODOWorld3D_Vert));
+  }
+  catch(const std::exception& e)
+  {
+    throw CommandError{e.what()};
+  }
+}
+
+void
+unload_world_vert_uniform_buffer(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  self->ub_world_vert.clear();
+}
+
+void
+load_world_frag_uniform_buffer(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  try
+  {
+    self->ub_world_frag.reserve(cg_core.vk_swapchain->images_count);
+    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+      self->ub_world_frag.emplace_back(
+	cg_core.vk_device_with_swapchain, sizeof(VK::ODOWorld3D_Frag));
+  }
+  catch(const std::exception& e)
+  {
+    throw CommandError{e.what()};
+  }
+}
+
+void
+unload_world_frag_uniform_buffer(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  self->ub_world_frag.clear();
+}
+
+void
+load_descriptor_pool(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  uint32_t uniform_buffers_count =
+    self->ub_world_vert.size() + self->ub_world_vert.size();
+
+  VkDescriptorPoolSize descriptor_pool_size{};
+  descriptor_pool_size.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+  descriptor_pool_size.descriptorCount = uniform_buffers_count;
+
+  VkDescriptorPoolCreateInfo pool_info{};
+  pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
+  pool_info.pNext = nullptr;
+  pool_info.flags = 0;
+  pool_info.maxSets = uniform_buffers_count;
+  pool_info.poolSizeCount = 1;
+  pool_info.pPoolSizes = &descriptor_pool_size;
+
+  if(vkCreateDescriptorPool(
+       cg_core.vk_device_with_swapchain->device, &pool_info, nullptr,
+       &self->descriptor_pool) != VK_SUCCESS)
+    throw CommandError{"Failed to create a Vulkan descriptor pool."};
+}
+
+void
+unload_descriptor_pool(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  vkDestroyDescriptorPool(
+    cg_core.vk_device_with_swapchain->device, self->descriptor_pool,
+    nullptr);
+}
+
+void
+load_descriptor_sets_world(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  std::vector<VkDescriptorSetLayout> layouts(
+    cg_core.vk_swapchain->images_count,
+    cg_core.vk_graphics_pipeline_3d_layout->descriptor_set_world);
+
+  VkDescriptorSetAllocateInfo alloc_info{};
+  alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
+  alloc_info.descriptorPool = self->descriptor_pool;
+  alloc_info.descriptorSetCount = layouts.size();
+  alloc_info.pSetLayouts = layouts.data();
+
+  self->descriptor_sets_world.resize(layouts.size());
+  if(vkAllocateDescriptorSets(
+       cg_core.vk_device_with_swapchain->device, &alloc_info,
+       self->descriptor_sets_world.data()) != VK_SUCCESS)
+    throw CommandError{"Failed to create Vulkan world descriptor set."};
+}
+
+void
+load_resources_to_descriptor_sets(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+  {
+    VkDescriptorBufferInfo world_vert_info{};
+    world_vert_info.buffer = self->ub_world_vert[i].buffer;
+    world_vert_info.offset = 0;
+    world_vert_info.range = sizeof(VK::ODOWorld3D_Vert);
+
+    VkDescriptorBufferInfo world_frag_info{};
+    world_frag_info.buffer = self->ub_world_frag[i].buffer;
+    world_frag_info.offset = 0;
+    world_frag_info.range = sizeof(VK::ODOWorld3D_Frag);
+
+    std::array<VkWriteDescriptorSet, 2> write_descriptors{};
+    write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+    write_descriptors[0].dstSet = self->descriptor_sets_world[i];
+    write_descriptors[0].dstBinding = 0;
+    write_descriptors[0].dstArrayElement = 0;
+    write_descriptors[0].descriptorCount = 1;
+    write_descriptors[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+    write_descriptors[0].pBufferInfo = &world_vert_info;
+    write_descriptors[0].pImageInfo = nullptr;
+    write_descriptors[0].pTexelBufferView = nullptr;
+
+    write_descriptors[1].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+    write_descriptors[1].dstSet = self->descriptor_sets_world[i];
+    write_descriptors[1].dstBinding = 1;
+    write_descriptors[1].dstArrayElement = 0;
+    write_descriptors[1].descriptorCount = 1;
+    write_descriptors[1].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+    write_descriptors[1].pBufferInfo = &world_frag_info;
+    write_descriptors[1].pImageInfo = nullptr;
+    write_descriptors[1].pTexelBufferView = nullptr;
+
+    vkUpdateDescriptorSets(
+      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
+      write_descriptors.data(), 0, nullptr);
+  }
+}
+
+void
+load_depth_image(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  VkExtent3D extent3d{};
+  extent3d.width = cg_core.display_width;
+  extent3d.height = cg_core.display_height;
+  extent3d.depth = 1;
+
+  try
+  {
+    VK::Image::create(
+      cg_core.vk_device_with_swapchain,
+      &self->depth_image,
+      &self->depth_image_memory,
+      VK_FORMAT_D32_SFLOAT,
+      extent3d,
+      1,
+      VK_IMAGE_TILING_OPTIMAL,
+      VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT
+      );
+  }
+  catch(VK::Image::Error error)
+  {
+    std::string error_message{"Failed to create depth image → "};
+    error_message += error.what();
+    throw CommandError{error_message};
+  }
+}
+
+void
+unload_depth_image(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  vkDestroyImage(
+    cg_core.vk_device_with_swapchain->device, self->depth_image,
+    nullptr);
+  vkFreeMemory(
+    cg_core.vk_device_with_swapchain->device,
+    self->depth_image_memory, nullptr);
+}
+
+void
+load_depth_image_view(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  try
+  {
+    VK::Image::create_view(
+      cg_core.vk_device_with_swapchain, &self->depth_image_view,
+      self->depth_image,
+      VK_FORMAT_D32_SFLOAT, VK_IMAGE_ASPECT_DEPTH_BIT);
+  }
+  catch(VK::Image::Error error)
+  {
+    std::string error_message{"Failed to create depth image view → "};
+    error_message += error.what();
+    throw CommandError{error_message};
+  }
+}
+
+void
+unload_depth_image_view(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  vkDestroyImageView(
+    cg_core.vk_device_with_swapchain->device, self->depth_image_view, nullptr);
+}
+
+void
+load_framebuffer(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  self->swapchain_framebuffers.resize(cg_core.vk_swapchain->images_count);
+  for (auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+  {
+    std::array<VkImageView, 2> attachments = {
+      cg_core.vk_swapchain->image_views[i],
+      self->depth_image_view
+    };
+
+    VkFramebufferCreateInfo framebuffer_info{};
+    framebuffer_info.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
+    framebuffer_info.renderPass =
+      cg_core.vk_graphics_pipeline_3d_layout->render_pass;
+    framebuffer_info.attachmentCount = attachments.size();
+    framebuffer_info.pAttachments = attachments.data();
+    framebuffer_info.width = cg_core.display_width;
+    framebuffer_info.height = cg_core.display_height;
+
+    framebuffer_info.layers = 1;
+
+    if(vkCreateFramebuffer(
+	 cg_core.vk_device_with_swapchain->device, &framebuffer_info, nullptr,
+	 &self->swapchain_framebuffers[i]) != VK_SUCCESS)
+      throw CommandError{"Failed to create Vulkan Framebuffer."};
+  }
+}
+
+void
+unload_framebuffer(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  for(auto framebuffer: self->swapchain_framebuffers)
+    vkDestroyFramebuffer(
+      cg_core.vk_device_with_swapchain->device, framebuffer, nullptr);
+}
+
+void
+load_pipeline(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  VkPipelineShaderStageCreateInfo vert_shader_stage_info = {};
+  vert_shader_stage_info.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
+  vert_shader_stage_info.pNext = nullptr;
+  vert_shader_stage_info.flags = 0;
+  vert_shader_stage_info.stage = VK_SHADER_STAGE_VERTEX_BIT;
+  vert_shader_stage_info.module =
+    cg_core.vk_device_with_swapchain->vert3d_shader_module;
+  vert_shader_stage_info.pName = "main";
+  vert_shader_stage_info.pSpecializationInfo = nullptr;
+
+  VkPipelineShaderStageCreateInfo frag_shader_stage_info = {};
+  frag_shader_stage_info.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
+  frag_shader_stage_info.pNext = nullptr;
+  frag_shader_stage_info.flags = 0;
+  frag_shader_stage_info.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
+  frag_shader_stage_info.module =
+    cg_core.vk_device_with_swapchain->frag3d_shader_module;
+  frag_shader_stage_info.pName = "main";
+  frag_shader_stage_info.pSpecializationInfo = nullptr;
+
+  VkPipelineShaderStageCreateInfo shader_stages[] = {
+    vert_shader_stage_info,
+    frag_shader_stage_info
+  };
+
+  VkVertexInputBindingDescription vertex_input_binding{};
+  vertex_input_binding.binding = 0;
+  vertex_input_binding.stride = sizeof(VK::SkeletalMeshVertex);
+  vertex_input_binding.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
+
+  std::array<VkVertexInputAttributeDescription, 5> vertex_attribute{};
+  // Position.
+  vertex_attribute[0].location = 0;
+  vertex_attribute[0].binding = 0;
+  vertex_attribute[0].format = VK_FORMAT_R32G32B32_SFLOAT;
+  vertex_attribute[0].offset = offsetof(VK::SkeletalMeshVertex, position);
+  // Normal.
+  vertex_attribute[1].location = 1;
+  vertex_attribute[1].binding = 0;
+  vertex_attribute[1].format = VK_FORMAT_R32G32B32_SFLOAT;
+  vertex_attribute[1].offset = offsetof(VK::SkeletalMeshVertex, normal);
+  // Texture coordinate.
+  vertex_attribute[2].location = 2;
+  vertex_attribute[2].binding = 0;
+  vertex_attribute[2].format = VK_FORMAT_R32G32_SFLOAT;
+  vertex_attribute[2].offset = offsetof(VK::SkeletalMeshVertex, texture_coord);
+  // Bones ids.
+  vertex_attribute[3].location = 3;
+  vertex_attribute[3].binding = 0;
+  vertex_attribute[3].format = VK_FORMAT_R32G32B32A32_SINT;
+  vertex_attribute[3].offset = offsetof(VK::SkeletalMeshVertex, bone_ids);
+  // Bones weights.
+  vertex_attribute[4].location = 4;
+  vertex_attribute[4].binding = 0;
+  vertex_attribute[4].format = VK_FORMAT_R32G32B32A32_SFLOAT;
+  vertex_attribute[4].offset = offsetof(VK::SkeletalMeshVertex, bone_weights);
+
+  VkPipelineVertexInputStateCreateInfo vertex_input_info = {};
+  vertex_input_info.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
+  vertex_input_info.pNext = nullptr;
+  vertex_input_info.flags = 0;
+  vertex_input_info.vertexBindingDescriptionCount = 1;
+  vertex_input_info.pVertexBindingDescriptions = &vertex_input_binding;
+  vertex_input_info.vertexAttributeDescriptionCount =
+      static_cast<uint32_t>(vertex_attribute.size());
+  vertex_input_info.pVertexAttributeDescriptions = vertex_attribute.data();
+
+  VkPipelineInputAssemblyStateCreateInfo input_assembly = {};
+  input_assembly.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
+  input_assembly.pNext = nullptr;
+  input_assembly.flags = 0;
+  input_assembly.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
+  input_assembly.primitiveRestartEnable = VK_FALSE;
+
+  VkViewport viewport = {};
+  viewport.x = 0;
+  viewport.y = 0;
+  viewport.width = cg_core.display_width;
+  viewport.height = cg_core.display_height;
+  viewport.minDepth = 0.0f;
+  viewport.maxDepth = 1.0f;
+
+  VkRect2D scissor = {};
+  scissor.offset = {0, 0};
+  scissor.extent = {cg_core.display_width, cg_core.display_height};
+
+  VkPipelineViewportStateCreateInfo viewport_state = {};
+  viewport_state.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
+  viewport_state.pNext = nullptr;
+  viewport_state.flags = 0;
+  viewport_state.viewportCount = 1;
+  viewport_state.pViewports = &viewport;
+  viewport_state.scissorCount = 1;
+  viewport_state.pScissors = &scissor;
+
+  VkPipelineRasterizationStateCreateInfo rasterizer = {};
+  rasterizer.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
+  rasterizer.pNext = nullptr;
+  rasterizer.flags = 0;
+  rasterizer.depthClampEnable = VK_FALSE;
+  rasterizer.rasterizerDiscardEnable = VK_FALSE;
+  rasterizer.polygonMode = VK_POLYGON_MODE_FILL;
+  rasterizer.cullMode = VK_CULL_MODE_NONE;
+  rasterizer.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
+  rasterizer.depthBiasEnable = VK_FALSE;
+  rasterizer.depthBiasConstantFactor = 0.0f;
+  rasterizer.depthBiasClamp = 0.0f;
+  rasterizer.depthBiasSlopeFactor = 0.0f;
+  rasterizer.lineWidth = 1.0f;
+
+  VkPipelineMultisampleStateCreateInfo multisampling = {};
+  multisampling.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
+  multisampling.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
+  multisampling.sampleShadingEnable = VK_FALSE;
+  multisampling.minSampleShading = 1.0f;
+  multisampling.pSampleMask = nullptr;
+  multisampling.alphaToCoverageEnable = VK_FALSE;
+  multisampling.alphaToOneEnable = VK_FALSE;
+
+  VkPipelineDepthStencilStateCreateInfo depth_stencil = {};
+  depth_stencil.sType =
+    VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO;
+  depth_stencil.depthTestEnable = VK_TRUE;
+  depth_stencil.depthWriteEnable = VK_TRUE;
+  depth_stencil.depthCompareOp = VK_COMPARE_OP_LESS;
+  depth_stencil.depthBoundsTestEnable = VK_FALSE;
+  depth_stencil.minDepthBounds = 0.0f;
+  depth_stencil.maxDepthBounds = 1.0f;
+  depth_stencil.stencilTestEnable = VK_FALSE;
+  depth_stencil.front = {};
+  depth_stencil.back = {};
+
+  VkPipelineColorBlendAttachmentState color_blend_attachment = {};
+  color_blend_attachment.blendEnable = VK_FALSE;
+  color_blend_attachment.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
+  color_blend_attachment.dstColorBlendFactor = VK_BLEND_FACTOR_ZERO;
+  color_blend_attachment.colorBlendOp = VK_BLEND_OP_ADD;
+  color_blend_attachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
+  color_blend_attachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
+  color_blend_attachment.alphaBlendOp = VK_BLEND_OP_ADD;
+  color_blend_attachment.colorWriteMask =
+      VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |
+      VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
+
+  VkPipelineColorBlendStateCreateInfo color_blending = {};
+  color_blending.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
+  color_blending.pNext = nullptr;
+  color_blending.flags = 0;
+  color_blending.logicOpEnable = VK_FALSE;
+  color_blending.logicOp = VK_LOGIC_OP_COPY;
+  color_blending.attachmentCount = 1;
+  color_blending.pAttachments = &color_blend_attachment;
+  color_blending.blendConstants[0] = 0.0f;
+  color_blending.blendConstants[1] = 0.0f;
+  color_blending.blendConstants[2] = 0.0f;
+  color_blending.blendConstants[3] = 0.0f;
+
+  VkDynamicState dynamic_states[] = {
+    VK_DYNAMIC_STATE_VIEWPORT,
+    VK_DYNAMIC_STATE_LINE_WIDTH
+  };
+
+  VkPipelineDynamicStateCreateInfo dynamic_state_info = {};
+  dynamic_state_info.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
+  dynamic_state_info.dynamicStateCount = 2;
+  dynamic_state_info.pDynamicStates = dynamic_states;
+
+  VkGraphicsPipelineCreateInfo pipeline_info{};
+  pipeline_info.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
+  pipeline_info.pNext = nullptr;
+  pipeline_info.flags = 0;
+  pipeline_info.stageCount = 2;
+  pipeline_info.pStages = shader_stages;
+  pipeline_info.pVertexInputState = &vertex_input_info;
+  pipeline_info.pInputAssemblyState = &input_assembly;
+  pipeline_info.pTessellationState = nullptr;
+  pipeline_info.pViewportState = &viewport_state;
+  pipeline_info.pRasterizationState = &rasterizer;
+  pipeline_info.pMultisampleState = &multisampling;
+  pipeline_info.pDepthStencilState = &depth_stencil;
+  pipeline_info.pColorBlendState = &color_blending;
+  pipeline_info.pDynamicState = &dynamic_state_info;
+  pipeline_info.layout = cg_core.vk_graphics_pipeline_3d_layout->pipeline;
+  pipeline_info.renderPass =
+    cg_core.vk_graphics_pipeline_3d_layout->render_pass;
+  pipeline_info.subpass = 0;
+  pipeline_info.basePipelineHandle = VK_NULL_HANDLE;
+  pipeline_info.basePipelineIndex = -1;
+
+  if(vkCreateGraphicsPipelines(
+       cg_core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
+       &pipeline_info, nullptr, &self->graphic_pipeline)
+     != VK_SUCCESS)
+    throw CommandError{"Failed to create graphics pipeline."};
+}
+
+void
+unload_pipeline(void *obj)
+{
+  auto self = static_cast<VK::GraphicsPipeline3DSkeletal*>(obj);
+
+  vkDestroyPipeline(
+    cg_core.vk_device_with_swapchain->device, self->graphic_pipeline, nullptr);
+}
+
+const CommandChain loader{
+  {&load_world_vert_uniform_buffer, &unload_world_vert_uniform_buffer},
+  {&load_world_frag_uniform_buffer, &unload_world_frag_uniform_buffer},
+  {&load_descriptor_pool, &unload_descriptor_pool},
+  // By destroying the pool the sets are also destroyed.
+  {&load_descriptor_sets_world, nullptr},
+  {&load_resources_to_descriptor_sets, nullptr},
+  {&load_depth_image, &unload_depth_image},
+  {&load_depth_image_view, &unload_depth_image_view},
+  {&load_framebuffer, &unload_framebuffer},
+  {&load_pipeline, &unload_pipeline}
+};
+
+}
+
+namespace VK
+{
+
+GraphicsPipeline3DSkeletal::GraphicsPipeline3DSkeletal()
+{
+  loader.execute(this);
+}
+
+GraphicsPipeline3DSkeletal::~GraphicsPipeline3DSkeletal()
+{
+  loader.revert(this);
+}
+
+void
+GraphicsPipeline3DSkeletal::draw(
+  std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+  const size_t current_frame, const uint32_t image_index)
+{
+  { // Set viewport
+    VkViewport vk_viewport{};
+    vk_viewport.x = view->region.x;
+    vk_viewport.y = view->region.y;
+    vk_viewport.width = view->region.z;
+    vk_viewport.height = view->region.w;
+    vk_viewport.minDepth = 0.0f;
+    vk_viewport.maxDepth = 1.0f;
+    vkCmdSetViewport(draw_command_buffer, 0, 1, &vk_viewport);
+
+    VkRect2D vk_scissor{};
+    vk_scissor.offset.x = static_cast<int32_t>(view->region.x);
+    vk_scissor.offset.y = static_cast<int32_t>(view->region.y);
+    vk_scissor.extent.width = static_cast<uint32_t>(view->region.z);
+    vk_scissor.extent.height = static_cast<uint32_t>(view->region.w);
+    vkCmdSetScissor(draw_command_buffer, 0, 1, &vk_scissor);
+  }
+
+  // Draw models
+  for(auto& [skeletal_mesh, instances]:
+	cg_core.vk_renderer->skeletal_models_to_draw[current_frame])
+  {
+      VkBuffer vertex_buffers[]{skeletal_mesh->vertex_buffer->buffer};
+      VkDeviceSize offsets[]{0};
+
+      vkCmdBindPipeline(
+	draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
+	this->graphic_pipeline);
+      vkCmdBindVertexBuffers(
+	draw_command_buffer, 0, 1, vertex_buffers, offsets);
+      vkCmdBindIndexBuffer(
+	draw_command_buffer, skeletal_mesh->index_buffer->buffer, 0,
+	VK_INDEX_TYPE_UINT32);
+
+      for(auto &instance: instances)
+      { // Object matrix.
+        glm::mat4 base_matrix{1.0f};
+        base_matrix = glm::translate(base_matrix, *instance->position);
+        base_matrix = glm::rotate(
+          base_matrix, instance->rotation->x, glm::vec3{1.0, 0.0, 0.0});
+        base_matrix = glm::rotate(
+          base_matrix, instance->rotation->y, glm::vec3{0.0, 1.0, 0.0});
+        base_matrix = glm::rotate(
+          base_matrix, instance->rotation->z, glm::vec3{0.0, 0.0, 1.0});
+
+	std::array<VkDescriptorSet, 3> vk_descriptor_sets{
+	  this->descriptor_sets_world[image_index],
+	  view->descriptor_sets_3d[image_index],
+	  instance->descriptor_sets[image_index]};
+
+	vkCmdBindDescriptorSets(
+	  draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
+	  cg_core.vk_graphics_pipeline_3d_layout->pipeline, 0,
+	  vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
+
+        vkCmdDrawIndexed(
+          draw_command_buffer, skeletal_mesh->index_count, 1, 0, 0, 0);
+
+	VK::ODOSkeletalModel odo_skeletal_model{};
+	instance->tick(cg_core.delta_time);
+	odo_skeletal_model.base_matrix = base_matrix;
+	std::copy(instance->bone_transforms.begin(),
+		  instance->bone_transforms.end(),
+		  odo_skeletal_model.bone_matrices);
+	instance->uniform_buffers[image_index].copy_data(&odo_skeletal_model);
+      }
+  }
+
+  { // Update view uniform buffers
+    VK::ODOView3D ubo_view_3d{};
+
+    // View matrix.
+    ubo_view_3d.view = glm::mat4{1.0f};
+    ubo_view_3d.view = glm::translate(
+      ubo_view_3d.view, *view->camera_position);
+    ubo_view_3d.view = glm::rotate(
+      ubo_view_3d.view, view->camera_rotation->y, glm::vec3{0.0, 1.0, 0.0});
+    ubo_view_3d.view = glm::rotate(
+      ubo_view_3d.view, view->camera_rotation->x, glm::vec3{1.0, 0.0, 0.0});
+    ubo_view_3d.view = glm::rotate(
+      ubo_view_3d.view, view->camera_rotation->z, glm::vec3{0.0, 0.0, 1.0});
+    ubo_view_3d.view = glm::inverse(ubo_view_3d.view);
+
+    // Projection matrix.
+    ubo_view_3d.proj = glm::perspective(
+      glm::radians(45.0f),
+      view->region.z / view->region.w,
+      0.1f, 100.0f);
+
+    view->ub_3d[image_index].copy_data(&ubo_view_3d);
+  }
+
+  // TODO: Do not update this for each view. All views use the same data.
+  { // Update world uniform buffer
+    ODOWorld3D_Vert ubo_world_3d_vert{};
+    ubo_world_3d_vert.ambient_light_color = glm::vec4{0.25, 0.25, 0.25, 1.0};
+    this->ub_world_vert[image_index].copy_data(&ubo_world_3d_vert);
+
+    ODOWorld3D_Frag ubo_world_3d_frag{};
+    ubo_world_3d_frag.directional_light_direction =
+      glm::vec3{-0.57735, 0.57735, -0.57735};
+    ubo_world_3d_frag.directional_light_color = glm::vec4{0.8, 0.8, 0.8, 1.0};
+    this->ub_world_frag[image_index].copy_data(&ubo_world_3d_frag);
+  }
+}
+
+}
diff --git a/src/vk/graphics_pipeline_3d_skeletal.hpp b/src/vk/graphics_pipeline_3d_skeletal.hpp
new file mode 100644
index 0000000..9563e14
--- /dev/null
+++ b/src/vk/graphics_pipeline_3d_skeletal.hpp
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_VK_GRAPHICS_PIPELINE_3D_SKELETAL_H
+#define CANDY_GEAR_VK_GRAPHICS_PIPELINE_3D_SKELETAL_H 1
+
+#include <memory>
+#include <unordered_map>
+
+#include "../command.hpp"
+#include "core.hpp"
+#include "command_pool.hpp"
+#include "skeletal_model.hpp"
+#include "uniform_buffer.hpp"
+#include "view_3d.hpp"
+
+namespace VK
+{
+
+struct GraphicsPipeline3DSkeletal
+{
+  // Depth image.
+  VkImage depth_image;
+  VkDeviceMemory depth_image_memory;
+  VkImageView depth_image_view;
+
+  // FIXME: if this vector get resized, it will cause a segmentation fault!
+  std::vector<UniformBuffer> ub_world_vert;
+  std::vector<UniformBuffer> ub_world_frag;
+
+  VkDescriptorPool descriptor_pool;
+  std::vector<VkDescriptorSet> descriptor_sets_world;
+
+  std::vector<VkFramebuffer> swapchain_framebuffers;
+  VkPipeline graphic_pipeline;
+
+  GraphicsPipeline3DSkeletal();
+  ~GraphicsPipeline3DSkeletal();
+
+  void
+  draw(std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+       const size_t current_frame, const uint32_t image_index);
+};
+
+}
+
+#endif /* CANDY_GEAR_VK_GRAPHICS_PIPELINE_SKELETAL_3D_H */
diff --git a/src/vk/renderer.cpp b/src/vk/renderer.cpp
index a7e5f35..b240cb9 100644
--- a/src/vk/renderer.cpp
+++ b/src/vk/renderer.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -143,7 +143,8 @@ namespace VK
 
 Renderer::Renderer(std::vector<std::shared_ptr<View2D>> views_2d,
                    std::vector<std::shared_ptr<View3D>> views_3d):
-  models_to_draw{cg_core.vk_swapchain->images_count},
+  skeletal_models_to_draw{cg_core.vk_swapchain->images_count},
+  static_models_to_draw{cg_core.vk_swapchain->images_count},
   views_2d{views_2d},
   views_3d{views_3d}
 {
@@ -347,14 +348,15 @@ Renderer::draw()
 
     // Prepare for the next frame.
     {
-      this->models_to_draw[next_frame].clear();
+      this->skeletal_models_to_draw[next_frame].clear();
+      this->static_models_to_draw[next_frame].clear();
       cg_core.vk_swapchain->current_frame = next_frame;
     }
   }
   else
   {
     // Clear images for the current frame because we are skipping this frame.
-    this->models_to_draw[cg_core.vk_swapchain->current_frame].clear();
+    this->skeletal_models_to_draw[cg_core.vk_swapchain->current_frame].clear();
     for(auto &view: this->views_2d)
       view->sprites_to_draw[cg_core.vk_swapchain->current_frame].clear();
     for(auto &view: this->views_3d)
diff --git a/src/vk/renderer.hpp b/src/vk/renderer.hpp
index 551e4e5..7c7d111 100644
--- a/src/vk/renderer.hpp
+++ b/src/vk/renderer.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,8 +22,10 @@
 #include <vector>
 
 #include "core.hpp"
-#include "model.hpp"
-#include "model_instance.hpp"
+#include "skeletal_mesh.hpp"
+#include "skeletal_model.hpp"
+#include "static_mesh.hpp"
+#include "static_model.hpp"
 #include "queue_family.hpp"
 #include "view_2d.hpp"
 #include "view_3d.hpp"
@@ -33,9 +35,17 @@ namespace VK
 
 struct Renderer
 {
-  std::vector<std::unordered_map<
-    std::shared_ptr<Model>, std::vector<ModelInstance>>>
-  models_to_draw;
+  std::vector<
+    std::unordered_map<
+      std::shared_ptr<SkeletalMesh>,
+      std::vector<std::shared_ptr<SkeletalModel>>>>
+  skeletal_models_to_draw;
+
+  std::vector<
+    std::unordered_map<
+      std::shared_ptr<StaticMesh>,
+      std::vector<std::shared_ptr<StaticModel>>>>
+  static_models_to_draw;
 
   VkDescriptorPool descriptor_pool;
   std::vector<std::shared_ptr<View2D>> views_2d;
diff --git a/src/vk/skeletal_mesh.cpp b/src/vk/skeletal_mesh.cpp
new file mode 100644
index 0000000..b65d27d
--- /dev/null
+++ b/src/vk/skeletal_mesh.cpp
@@ -0,0 +1,204 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "skeletal_mesh.hpp"
+
+#include "../binary_reader.hpp"
+#include "../command.hpp"
+#include "../core.hpp"
+#include "skeletal_mesh_vertex.hpp"
+
+namespace
+{
+
+// Data that is only needed for the command chain but not for the SkeletalMesh
+// goes here.
+struct MeshBuilder
+{
+  std::string mesh_path;
+  VK::SkeletalMesh *mesh;
+
+  MeshBuilder(VK::SkeletalMesh *m, std::string mp);
+  MeshBuilder(VK::SkeletalMesh *m, const char* mp);
+};
+
+MeshBuilder::MeshBuilder(VK::SkeletalMesh *m, std::string mp):
+  mesh{m},
+  mesh_path{mp}
+{
+}
+
+MeshBuilder::MeshBuilder(VK::SkeletalMesh *m, const char *mp):
+  MeshBuilder{m, std::string(mp)}
+{
+}
+
+void
+load_mesh(void *obj)
+{
+  auto self = static_cast<MeshBuilder*>(obj);
+
+  BinaryReader input{self->mesh_path};
+
+  self->mesh->queue_family =
+    cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
+
+  { // Load vertexes.
+    auto vertex_count{input.read_ui32()};
+    std::vector<VK::SkeletalMeshVertex> vertexes{vertex_count};
+
+    for(auto i{0}; i < vertex_count; i++)
+    {
+      vertexes[i].position = input.read_vec3();
+      vertexes[i].normal = input.read_vec3();
+      vertexes[i].texture_coord = input.read_vec2();
+
+      for(auto ii{0}; ii < VK::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
+	  ii++)
+	vertexes[i].bone_ids[ii] = input.read_ui32();
+
+      for(auto ii{0}; ii < VK::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
+	  ii++)
+	vertexes[i].bone_weights[ii] = input.read_float();
+    }
+
+    void *vertexes_data{vertexes.data()};
+    size_t vertexes_size = sizeof(vertexes[0]) * vertexes.size();
+    self->mesh->source_vertex_buffer = new VK::SourceBuffer{
+      self->mesh->queue_family->device, vertexes_data, vertexes_size};
+    self->mesh->vertex_buffer = new VK::DestinationBuffer{
+      self->mesh->queue_family, self->mesh->source_vertex_buffer,
+      VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
+  }
+
+  { // Load indexes.
+    self->mesh->index_count = input.read_ui32();
+    std::vector<uint32_t> indexes(self->mesh->index_count);
+
+    for(auto i{0}; i < self->mesh->index_count; i++)
+      indexes[i] = input.read_ui32();
+
+    void *indexes_data{indexes.data()};
+    size_t indexes_size{sizeof(indexes[0]) * indexes.size()};
+    VK::SourceBuffer source_index_buffer{
+      self->mesh->queue_family->device, indexes_data, indexes_size};
+    self->mesh->index_buffer = new VK::DestinationBuffer{
+      self->mesh->queue_family, &source_index_buffer,
+      VK_BUFFER_USAGE_INDEX_BUFFER_BIT};
+  }
+
+  { // Load bones
+    auto bone_count{input.read_ui32()};
+    self->mesh->bones.reserve(bone_count);
+    for(int i{0}; i < bone_count; i++)
+      self->mesh->bones.emplace_back(input.read_mat4());
+  }
+
+  { // Load animations
+    auto num_animations{input.read_ui32()};
+    self->mesh->animations.resize(num_animations);
+    for(uint32_t i{0}; i < num_animations; i++)
+    {
+      auto duration{input.read_double()};
+      self->mesh->animations[i].final_time = (float)duration;
+
+      auto ticks_per_second{input.read_double()};
+
+      auto num_bone_transforms{input.read_ui32()};
+      std::vector<VK::BoneTransform> *bone_transforms =
+	&(self->mesh->animations[i].bone_transforms);
+      bone_transforms->resize(num_bone_transforms);
+      for(uint32_t bone_transform_index{0};
+	  bone_transform_index < num_bone_transforms; bone_transform_index++)
+      {
+	auto bone_id{input.read_ui32()};
+
+	auto num_positions{input.read_ui32()};
+	VK::Channel<glm::vec3> *positions =
+	  &((*bone_transforms)[bone_transform_index].positions);
+	for(auto position_key_index{0}; position_key_index < num_positions;
+	    position_key_index++)
+	{
+	  auto vec3{input.read_vec3()};
+	  auto timestamp{input.read_double()};
+	  positions->key_frames.emplace_back(
+	    vec3, static_cast<float>(timestamp));
+	}
+
+	auto num_rotations{input.read_ui32()};
+	VK::Channel<glm::quat> *rotations =
+	  &((*bone_transforms)[bone_transform_index].rotations);
+	for(auto rotation_key_index{0}; rotation_key_index < num_rotations;
+	    rotation_key_index++)
+	{
+	  auto quat{input.read_quat()};
+	  auto timestamp{input.read_double()};
+	  rotations->key_frames.emplace_back(
+	    quat, static_cast<float>(timestamp));
+	}
+
+	auto num_scales{input.read_ui32()};
+	VK::Channel<glm::vec3> *scales =
+	  &((*bone_transforms)[bone_transform_index].scales);
+	for(auto scaling_key_index{0}; scaling_key_index < num_scales;
+	    scaling_key_index++)
+	{
+	  auto vec3{input.read_vec3()};
+	  auto timestamp{input.read_double()};
+	  scales->key_frames.emplace_back(vec3, static_cast<float>(timestamp));
+	}
+      }
+    }
+  }
+}
+
+void
+unload_mesh(void *obj)
+{
+  auto self = static_cast<MeshBuilder*>(obj);
+
+  delete self->mesh->index_buffer;
+  delete self->mesh->vertex_buffer;
+  delete self->mesh->source_vertex_buffer;
+}
+
+static const CommandChain loader{
+  {&load_mesh, &unload_mesh}
+};
+
+}
+
+namespace VK
+{
+
+SkeletalMesh::SkeletalMesh(std::string mesh_path)
+{
+  MeshBuilder mesh_builder(this, mesh_path);
+  loader.execute(&mesh_builder);
+}
+
+SkeletalMesh::SkeletalMesh(const char* mesh_path):
+  SkeletalMesh{std::string(mesh_path)}
+{
+}
+
+SkeletalMesh::~SkeletalMesh()
+{
+  MeshBuilder mesh_builder(this, "");
+  loader.revert(&mesh_builder);
+}
+
+}
diff --git a/src/vk/skeletal_mesh.hpp b/src/vk/skeletal_mesh.hpp
new file mode 100644
index 0000000..7fc8334
--- /dev/null
+++ b/src/vk/skeletal_mesh.hpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_VK_SKELETAL_MESH_H
+#define CANDY_GEAR_VK_SKELETAL_MESH_H 1
+
+#include <string>
+#include <vector>
+
+#include "animation.hpp"
+#include "core.hpp"
+#include "destination_buffer.hpp"
+#include "queue_family.hpp"
+#include "uniform_buffer.hpp"
+#include "texture.hpp"
+
+namespace VK
+{
+
+struct SkeletalMesh
+{
+  QueueFamily *queue_family;
+
+  uint32_t index_count;
+  SourceBuffer *source_vertex_buffer;
+  DestinationBuffer *index_buffer;
+  DestinationBuffer *vertex_buffer;
+
+  std::vector<Bone> bones;
+  std::vector<Animation> animations;
+
+  SkeletalMesh(std::string mesh_path);
+  SkeletalMesh(const char* mesh_path);
+  ~SkeletalMesh();
+};
+
+}
+
+#endif /* CANDY_GEAR_VK_SKELETAL_MESH_H */
diff --git a/src/vk/skeletal_mesh_vertex.hpp b/src/vk/skeletal_mesh_vertex.hpp
new file mode 100644
index 0000000..b5bba3d
--- /dev/null
+++ b/src/vk/skeletal_mesh_vertex.hpp
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_VK_SKELETAL_MESH_VERTEX_H
+#define CANDY_GEAR_VK_SKELETAL_MESH_VERTEX_H 1
+
+#include "core.hpp"
+
+namespace VK
+{
+
+// This variable define the maximum ammount of bones that can influence a
+// vertex.
+const int SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES{4};
+const int SKELETAL_MESH_MAX_NUM_OF_BONES{50};
+
+struct SkeletalMeshVertex
+{
+  glm::vec3 position;
+  glm::vec3 normal;
+  glm::vec2 texture_coord;
+
+  uint32_t bone_ids[SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES];
+  float bone_weights[SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES];
+};
+
+}
+
+#endif /* CANDY_GEAR_VK_SKELETAL_MESH_VERTEX_H */
diff --git a/src/vk/skeletal_model.cpp b/src/vk/skeletal_model.cpp
new file mode 100644
index 0000000..8528535
--- /dev/null
+++ b/src/vk/skeletal_model.cpp
@@ -0,0 +1,256 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "skeletal_model.hpp"
+
+#include "../core.hpp"
+#include "uniform_data_object.hpp"
+
+namespace
+{
+
+void
+load_uniform_buffers(void *obj)
+{
+  auto self = static_cast<VK::SkeletalModel*>(obj);
+
+  try
+  {
+    self->uniform_buffers.reserve(cg_core.vk_swapchain->images_count);
+    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+      self->uniform_buffers.emplace_back(
+	cg_core.vk_device_with_swapchain, sizeof(VK::ODOSkeletalModel));
+  }
+  catch(const std::exception& e)
+  {
+    throw CommandError{e.what()};
+  }
+}
+
+void
+unload_uniform_buffers(void *obj)
+{
+  auto self = static_cast<VK::SkeletalModel*>(obj);
+
+  self->uniform_buffers.clear();
+}
+
+void
+load_descriptor_set_pool(void *obj)
+{
+  auto self = static_cast<VK::SkeletalModel*>(obj);
+
+  std::array<VkDescriptorPoolSize, 2> descriptor_pool_sizes{};
+  descriptor_pool_sizes[0].type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+  descriptor_pool_sizes[0].descriptorCount =
+    self->uniform_buffers.size();
+  descriptor_pool_sizes[1].type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
+  descriptor_pool_sizes[1].descriptorCount =
+    cg_core.vk_swapchain->images_count;
+
+  VkDescriptorPoolCreateInfo pool_info{};
+  pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
+  pool_info.pNext = nullptr;
+  pool_info.flags = 0;
+  pool_info.maxSets = self->uniform_buffers.size();
+  pool_info.poolSizeCount = descriptor_pool_sizes.size();
+  pool_info.pPoolSizes = descriptor_pool_sizes.data();
+
+  if(vkCreateDescriptorPool(
+       self->skeletal_mesh->queue_family->device->device, &pool_info, nullptr,
+       &self->descriptor_pool) != VK_SUCCESS)
+    throw CommandError{"Failed to create a Vulkan descriptor pool."};
+}
+
+void
+unload_descriptor_set_pool(void *obj)
+{
+  auto self = static_cast<VK::SkeletalModel*>(obj);
+
+  vkDestroyDescriptorPool(
+    self->skeletal_mesh->queue_family->device->device, self->descriptor_pool,
+    nullptr);
+}
+
+void
+load_descriptor_sets(void *obj)
+{
+  auto self = static_cast<VK::SkeletalModel*>(obj);
+
+  std::vector<VkDescriptorSetLayout> layouts(
+    cg_core.vk_swapchain->images_count,
+    cg_core.vk_graphics_pipeline_3d_layout->descriptor_set_skeletal_model);
+
+  VkDescriptorSetAllocateInfo alloc_info{};
+  alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
+  alloc_info.descriptorPool = self->descriptor_pool;
+  alloc_info.descriptorSetCount = layouts.size();
+  alloc_info.pSetLayouts = layouts.data();
+
+  self->descriptor_sets.resize(layouts.size());
+  if(vkAllocateDescriptorSets(
+       self->skeletal_mesh->queue_family->device->device, &alloc_info,
+       self->descriptor_sets.data()) != VK_SUCCESS)
+    CommandError{"Failed to create Vulkan descriptor set."};
+}
+
+void
+load_buffers_to_descriptor_sets(void *obj)
+{
+  auto self = static_cast<VK::SkeletalModel*>(obj);
+
+  for(auto i{0}; i < self->uniform_buffers.size(); i++)
+  {
+    VkDescriptorBufferInfo buffer_info{};
+    buffer_info.buffer = self->uniform_buffers[i].buffer;
+    buffer_info.offset = 0;
+    buffer_info.range = sizeof(VK::ODOSkeletalModel);
+
+    VkDescriptorImageInfo image_info{};
+    image_info.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
+    image_info.imageView = self->texture->view;
+    image_info.sampler = self->texture->sampler;
+
+    std::array<VkWriteDescriptorSet, 2> write_descriptors{};
+    write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+    write_descriptors[0].dstSet = self->descriptor_sets[i];
+    write_descriptors[0].dstBinding = 0;
+    write_descriptors[0].dstArrayElement = 0;
+    write_descriptors[0].descriptorCount = 1;
+    write_descriptors[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+    write_descriptors[0].pBufferInfo = &buffer_info;
+    write_descriptors[0].pImageInfo = nullptr;
+    write_descriptors[0].pTexelBufferView = nullptr;
+    write_descriptors[1].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+    write_descriptors[1].dstSet = self->descriptor_sets[i];
+    write_descriptors[1].dstBinding = 1;
+    write_descriptors[1].dstArrayElement = 0;
+    write_descriptors[1].descriptorCount = 1;
+    write_descriptors[1].descriptorType =
+      VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
+    write_descriptors[1].pBufferInfo = nullptr;
+    write_descriptors[1].pImageInfo = &image_info;
+    write_descriptors[1].pTexelBufferView = nullptr;
+
+    vkUpdateDescriptorSets(
+      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
+      write_descriptors.data(), 0, nullptr);
+  }
+}
+
+static const CommandChain loader{
+  {&load_uniform_buffers, &unload_uniform_buffers},
+  {&load_descriptor_set_pool, &unload_descriptor_set_pool},
+  {&load_descriptor_sets, nullptr},
+  {&load_buffers_to_descriptor_sets, nullptr}
+};
+
+}
+
+namespace VK
+{
+
+SkeletalModel::SkeletalModel(
+  std::shared_ptr<SkeletalMesh> skeletal_mesh,
+  std::shared_ptr<Texture> texture, std::shared_ptr<glm::vec3> position,
+  std::shared_ptr<glm::vec3> rotation):
+  skeletal_mesh{skeletal_mesh},
+  texture{texture},
+  position{position},
+  rotation{rotation},
+  animation_index{0},
+  animation_time{0.0f},
+  bone_transforms(SKELETAL_MESH_MAX_NUM_OF_BONES)
+{
+  loader.execute(this);
+
+  for(int i{0}; i < skeletal_mesh->bones.size(); i++)
+    this->bone_transforms[i] = skeletal_mesh->bones[i].offset_matrix;
+}
+
+SkeletalModel::~SkeletalModel()
+{
+  loader.revert(this);
+}
+
+void
+SkeletalModel::tick(float delta)
+{
+  VK::Animation *current_animation =
+    &this->skeletal_mesh->animations[this->animation_index];
+
+  { // update time
+    this->animation_time += delta;
+    if(this->animation_time > current_animation->final_time)
+    {
+      this->animation_time -= current_animation->final_time;
+      for(VK::BoneTransform &bone_transform:
+	    current_animation->bone_transforms)
+      {
+	bone_transform.positions.current_index = 0;
+	bone_transform.rotations.current_index = 0;
+	bone_transform.scales.current_index = 0;
+      }
+    }
+  }
+
+  for(int i{0}; i < current_animation->bone_transforms.size(); i++)
+  {
+    VK::BoneTransform *bone_transform = &current_animation->bone_transforms[i];
+
+    auto position{bone_transform->positions.interpolate(
+	this->animation_time,
+	[](glm::vec3 frame)
+	  {
+	    return glm::translate(glm::mat4(1.0f), frame);
+	  },
+	[](glm::vec3 previous_frame, glm::vec3 next_frame, float scale_factor)
+	  {
+	    glm::vec3 final_position{glm::mix(
+		previous_frame, next_frame, scale_factor)};
+	    return glm::translate(glm::mat4(1.0f), final_position);
+	  })};
+
+    auto rotation{bone_transform->rotations.interpolate(
+	this->animation_time,
+	[](glm::quat frame)
+	  {
+	    return glm::toMat4(glm::normalize(frame));
+	  },
+	[](glm::quat previous_frame, glm::quat next_frame, float scale_factor)
+	  {
+	    return glm::toMat4(glm::slerp(
+				 previous_frame, next_frame, scale_factor));
+	  })};
+
+    auto scale{bone_transform->scales.interpolate(
+	this->animation_time,
+	[](glm::vec3 frame)
+	  {
+	    return glm::scale(glm::mat4(1.0f), frame);
+	  },
+	[](glm::vec3 previous_frame, glm::vec3 next_frame, float scale_factor)
+	  {
+	    glm::vec3 scale{glm::mix(
+		previous_frame, next_frame, scale_factor)};
+	    return glm::scale(glm::mat4(1.0f), scale);
+	  })};
+
+    this->bone_transforms[i] = position * rotation * scale;
+  }
+}
+
+}
diff --git a/src/vk/skeletal_model.hpp b/src/vk/skeletal_model.hpp
new file mode 100644
index 0000000..1043e0f
--- /dev/null
+++ b/src/vk/skeletal_model.hpp
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_VK_SKELETAL_MODEL_H
+#define CANDY_GEAR_VK_SKELETAL_MODEL_H 1
+
+#include <memory>
+#include <vector>
+
+#include "core.hpp"
+#include "skeletal_mesh.hpp"
+
+namespace VK
+{
+
+struct SkeletalModel
+{
+  std::shared_ptr<SkeletalMesh> skeletal_mesh;
+  std::shared_ptr<Texture> texture;
+  std::vector<UniformBuffer> uniform_buffers;
+  std::shared_ptr<glm::vec3> position, rotation;
+  int animation_index;
+  float animation_time;
+  std::vector<glm::mat4> bone_transforms;
+
+  VkDescriptorPool descriptor_pool;
+  std::vector<VkDescriptorSet> descriptor_sets;
+
+  SkeletalModel(
+    std::shared_ptr<SkeletalMesh> skeletal_mesh,
+    std::shared_ptr<Texture> texture, std::shared_ptr<glm::vec3> position,
+    std::shared_ptr<glm::vec3> rotation);
+  ~SkeletalModel();
+
+  void
+  tick(float delta);
+};
+
+}
+
+#endif /* CANDY_GEAR_VK_SKELETAL_MODEL_H */
diff --git a/src/vk/mesh.cpp b/src/vk/static_mesh.cpp
index 9afeac3..29034df 100644
--- a/src/vk/mesh.cpp
+++ b/src/vk/static_mesh.cpp
@@ -14,34 +14,34 @@
  * limitations under the License.
  */
 
-#include "mesh.hpp"
+#include "static_mesh.hpp"
 
 #include "../binary_reader.hpp"
 #include "../command.hpp"
 #include "../core.hpp"
-#include "vertex_3d.hpp"
+#include "static_mesh_vertex.hpp"
 
 namespace
 {
 
-// Data that is only needed for the command chain but not for the Mesh goes
-// here.
+// Data that is only needed for the command chain but not for the StaticMesh
+// goes here.
 struct MeshBuilder
 {
   std::string mesh_path;
-  VK::Mesh *mesh;
+  VK::StaticMesh *mesh;
 
-  MeshBuilder(VK::Mesh *m, std::string mp);
-  MeshBuilder(VK::Mesh *m, const char* mp);
+  MeshBuilder(VK::StaticMesh *m, std::string mp);
+  MeshBuilder(VK::StaticMesh *m, const char* mp);
 };
 
-MeshBuilder::MeshBuilder(VK::Mesh *m, std::string mp):
+MeshBuilder::MeshBuilder(VK::StaticMesh *m, std::string mp):
   mesh{m},
   mesh_path{mp}
 {
 }
 
-MeshBuilder::MeshBuilder(VK::Mesh *m, const char *mp):
+MeshBuilder::MeshBuilder(VK::StaticMesh *m, const char *mp):
   MeshBuilder{m, std::string(mp)}
 {
 }
@@ -56,10 +56,9 @@ load_mesh(void *obj)
   self->mesh->queue_family =
     cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
 
-  // Load vertexes.
-  {
+  { // Load vertexes.
     auto vertex_count{input.read_ui32()};
-    std::vector<VK::Vertex3D> vertexes{vertex_count};
+    std::vector<VK::StaticMeshVertex> vertexes{vertex_count};
 
     for(auto i{0}; i < vertex_count; i++)
     {
@@ -77,8 +76,7 @@ load_mesh(void *obj)
       VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
   }
 
-  // Load indexes.
-  {
+  { // Load indexes
     self->mesh->index_count = input.read_ui32();
     std::vector<uint32_t> indexes(self->mesh->index_count);
 
@@ -114,18 +112,18 @@ static const CommandChain loader{
 namespace VK
 {
 
-Mesh::Mesh(std::string mesh_path)
+StaticMesh::StaticMesh(std::string mesh_path)
 {
   MeshBuilder mesh_builder(this, mesh_path);
   loader.execute(&mesh_builder);
 }
 
-Mesh::Mesh(const char* mesh_path):
-  Mesh{std::string(mesh_path)}
+StaticMesh::StaticMesh(const char* mesh_path):
+  StaticMesh{std::string(mesh_path)}
 {
 }
 
-Mesh::~Mesh()
+StaticMesh::~StaticMesh()
 {
   MeshBuilder mesh_builder(this, "");
   loader.revert(&mesh_builder);
diff --git a/src/vk/mesh.hpp b/src/vk/static_mesh.hpp
index 97b9d8a..0ab38b2 100644
--- a/src/vk/mesh.hpp
+++ b/src/vk/static_mesh.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_VK_MESH_H
-#define CANDY_GEAR_VK_MESH_H 1
+#ifndef CANDY_GEAR_VK_STATIC_MESH_H
+#define CANDY_GEAR_VK_STATIC_MESH_H 1
 
 #include <string>
 #include <vector>
@@ -29,7 +29,7 @@
 namespace VK
 {
 
-struct Mesh
+struct StaticMesh
 {
   QueueFamily *queue_family;
 
@@ -38,11 +38,11 @@ struct Mesh
   DestinationBuffer *index_buffer;
   DestinationBuffer *vertex_buffer;
 
-  Mesh(std::string mesh_path);
-  Mesh(const char* mesh_path);
-  ~Mesh();
+  StaticMesh(std::string mesh_path);
+  StaticMesh(const char* mesh_path);
+  ~StaticMesh();
 };
 
 }
 
-#endif /* CANDY_GEAR_VK_MESH_H */
+#endif /* CANDY_GEAR_VK_STATIC_MESH_H */
diff --git a/src/vk/vertex_3d.hpp b/src/vk/static_mesh_vertex.hpp
index 8bb8675..7a91fe4 100644
--- a/src/vk/vertex_3d.hpp
+++ b/src/vk/static_mesh_vertex.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_VK_VERTEX_3D_H
-#define CANDY_GEAR_VK_VERTEX_3D_H 1
+#ifndef CANDY_GEAR_VK_STATIC_MESH_VERTEX_H
+#define CANDY_GEAR_VK_STATIC_MESH_VERTEX_H 1
 
 #include "core.hpp"
 
 namespace VK
 {
 
-struct Vertex3D
+struct StaticMeshVertex
 {
   glm::vec3 position;
   glm::vec3 normal;
@@ -31,4 +31,4 @@ struct Vertex3D
 
 }
 
-#endif /* CANDY_GEAR_VK_VERTEX_3D_H */
+#endif /* CANDY_GEAR_VK_STATIC_MESH_VERTEX_H */
diff --git a/src/vk/model.cpp b/src/vk/static_model.cpp
index 4f63ddb..bf1f0d3 100644
--- a/src/vk/model.cpp
+++ b/src/vk/static_model.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,9 +14,7 @@
  * limitations under the License.
  */
 
-#include "model.hpp"
-
-#include <array>
+#include "static_model.hpp"
 
 #include "../core.hpp"
 #include "uniform_data_object.hpp"
@@ -27,45 +25,52 @@ namespace
 void
 load_uniform_buffers(void *obj)
 {
-  auto self = static_cast<VK::Model*>(obj);
+  auto self = static_cast<VK::StaticModel*>(obj);
 
-  self->ub_model_instance.reserve(cg_core.vk_swapchain->images_count);
-  for(int i{0}; i < cg_core.vk_swapchain->images_count; i++)
-    self->ub_model_instance.emplace_back(
-      cg_core.vk_device_with_swapchain, sizeof(VK::ODOModelInstance));
+  try
+  {
+    self->uniform_buffers.reserve(cg_core.vk_swapchain->images_count);
+    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+      self->uniform_buffers.emplace_back(
+	cg_core.vk_device_with_swapchain, sizeof(VK::ODOStaticModel));
+  }
+  catch(const std::exception& e)
+  {
+    throw CommandError{e.what()};
+  }
 }
 
 void
 unload_uniform_buffers(void *obj)
 {
-  auto self = static_cast<VK::Model*>(obj);
+  auto self = static_cast<VK::StaticModel*>(obj);
 
-  self->ub_model_instance.clear();
+  self->uniform_buffers.clear();
 }
 
 void
 load_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<VK::Model*>(obj);
+  auto self = static_cast<VK::StaticModel*>(obj);
 
   std::array<VkDescriptorPoolSize, 2> descriptor_pool_sizes{};
   descriptor_pool_sizes[0].type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
   descriptor_pool_sizes[0].descriptorCount =
-    self->ub_model_instance.size();
+    self->uniform_buffers.size();
   descriptor_pool_sizes[1].type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
   descriptor_pool_sizes[1].descriptorCount =
-    self->ub_model_instance.size();
+    cg_core.vk_swapchain->images_count;
 
   VkDescriptorPoolCreateInfo pool_info{};
   pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
   pool_info.pNext = nullptr;
   pool_info.flags = 0;
-  pool_info.maxSets = self->ub_model_instance.size();
+  pool_info.maxSets = self->uniform_buffers.size();
   pool_info.poolSizeCount = descriptor_pool_sizes.size();
   pool_info.pPoolSizes = descriptor_pool_sizes.data();
 
   if(vkCreateDescriptorPool(
-       self->mesh->queue_family->device->device, &pool_info, nullptr,
+       self->static_mesh->queue_family->device->device, &pool_info, nullptr,
        &self->descriptor_pool) != VK_SUCCESS)
     throw CommandError{"Failed to create a Vulkan descriptor pool."};
 }
@@ -73,20 +78,21 @@ load_descriptor_set_pool(void *obj)
 void
 unload_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<VK::Model*>(obj);
+  auto self = static_cast<VK::StaticModel*>(obj);
 
   vkDestroyDescriptorPool(
-    self->mesh->queue_family->device->device, self->descriptor_pool, nullptr);
+    self->static_mesh->queue_family->device->device, self->descriptor_pool,
+    nullptr);
 }
 
 void
 load_descriptor_sets(void *obj)
 {
-  auto self = static_cast<VK::Model*>(obj);
+  auto self = static_cast<VK::StaticModel*>(obj);
 
   std::vector<VkDescriptorSetLayout> layouts(
     cg_core.vk_swapchain->images_count,
-    cg_core.vk_graphics_pipeline_3d_layout->descriptor_set_model_instance);
+    cg_core.vk_graphics_pipeline_3d_layout->descriptor_set_static_model);
 
   VkDescriptorSetAllocateInfo alloc_info{};
   alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
@@ -96,7 +102,7 @@ load_descriptor_sets(void *obj)
 
   self->descriptor_sets.resize(layouts.size());
   if(vkAllocateDescriptorSets(
-       self->mesh->queue_family->device->device, &alloc_info,
+       self->static_mesh->queue_family->device->device, &alloc_info,
        self->descriptor_sets.data()) != VK_SUCCESS)
     CommandError{"Failed to create Vulkan descriptor set."};
 }
@@ -104,31 +110,40 @@ load_descriptor_sets(void *obj)
 void
 load_buffers_to_descriptor_sets(void *obj)
 {
-  auto self = static_cast<VK::Model*>(obj);
+  auto self = static_cast<VK::StaticModel*>(obj);
 
-  for(auto i{0}; i < self->ub_model_instance.size(); i++)
+  for(auto i{0}; i < self->uniform_buffers.size(); i++)
   {
     VkDescriptorBufferInfo buffer_info{};
-    buffer_info.buffer = self->ub_model_instance[i].buffer;
+    buffer_info.buffer = self->uniform_buffers[i].buffer;
     buffer_info.offset = 0;
-    buffer_info.range = sizeof(VK::ODOModelInstance);
+    buffer_info.range = sizeof(VK::ODOStaticModel);
 
     VkDescriptorImageInfo image_info{};
     image_info.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
     image_info.imageView = self->texture->view;
     image_info.sampler = self->texture->sampler;
 
-    std::array<VkWriteDescriptorSet, 1> write_descriptors{};
+    std::array<VkWriteDescriptorSet, 2> write_descriptors{};
     write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
     write_descriptors[0].dstSet = self->descriptor_sets[i];
     write_descriptors[0].dstBinding = 0;
     write_descriptors[0].dstArrayElement = 0;
     write_descriptors[0].descriptorCount = 1;
-    write_descriptors[0].descriptorType =
-      VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
-    write_descriptors[0].pBufferInfo = nullptr;
-    write_descriptors[0].pImageInfo = &image_info;
+    write_descriptors[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+    write_descriptors[0].pBufferInfo = &buffer_info;
+    write_descriptors[0].pImageInfo = nullptr;
     write_descriptors[0].pTexelBufferView = nullptr;
+    write_descriptors[1].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+    write_descriptors[1].dstSet = self->descriptor_sets[i];
+    write_descriptors[1].dstBinding = 1;
+    write_descriptors[1].dstArrayElement = 0;
+    write_descriptors[1].descriptorCount = 1;
+    write_descriptors[1].descriptorType =
+      VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
+    write_descriptors[1].pBufferInfo = nullptr;
+    write_descriptors[1].pImageInfo = &image_info;
+    write_descriptors[1].pTexelBufferView = nullptr;
 
     vkUpdateDescriptorSets(
       cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
@@ -148,14 +163,19 @@ static const CommandChain loader{
 namespace VK
 {
 
-Model::Model(std::shared_ptr<Mesh> mesh, std::shared_ptr<Texture> texture):
-  mesh{mesh},
-  texture{texture}
+StaticModel::StaticModel(
+  std::shared_ptr<StaticMesh> static_mesh,
+  std::shared_ptr<Texture> texture, std::shared_ptr<glm::vec3> position,
+  std::shared_ptr<glm::vec3> rotation):
+  static_mesh{static_mesh},
+  texture{texture},
+  position{position},
+  rotation{rotation}
 {
   loader.execute(this);
 }
 
-Model::~Model()
+StaticModel::~StaticModel()
 {
   loader.revert(this);
 }
diff --git a/src/vk/model.hpp b/src/vk/static_model.hpp
index 72682b2..08c68c8 100644
--- a/src/vk/model.hpp
+++ b/src/vk/static_model.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,28 +14,35 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_VK_MODEL_H
-#define CANDY_GEAR_VK_MODEL_H 1
+#ifndef CANDY_GEAR_VK_STATIC_MODEL_H
+#define CANDY_GEAR_VK_STATIC_MODEL_H 1
 
-#include "mesh.hpp"
-#include "texture.hpp"
+#include <memory>
+#include <vector>
+
+#include "core.hpp"
+#include "static_mesh.hpp"
 
 namespace VK
 {
 
-struct Model
+struct StaticModel
 {
-  std::shared_ptr<Mesh> mesh;
+  std::shared_ptr<StaticMesh> static_mesh;
   std::shared_ptr<Texture> texture;
+  std::vector<UniformBuffer> uniform_buffers;
+  std::shared_ptr<glm::vec3> position, rotation;
 
-  std::vector<UniformBuffer> ub_model_instance;
   VkDescriptorPool descriptor_pool;
   std::vector<VkDescriptorSet> descriptor_sets;
 
-  Model(std::shared_ptr<Mesh> mesh, std::shared_ptr<Texture> texture);
-  ~Model();
+  StaticModel(
+    std::shared_ptr<StaticMesh> static_mesh,
+    std::shared_ptr<Texture> texture, std::shared_ptr<glm::vec3> position,
+    std::shared_ptr<glm::vec3> rotation);
+  ~StaticModel();
 };
 
 }
 
-#endif /* CANDY_GEAR_VK_MODEL_H */
+#endif /* CANDY_GEAR_VK_STATIC_MODEL_H */
diff --git a/src/vk/uniform_data_object.hpp b/src/vk/uniform_data_object.hpp
index 102b82d..4ee4e73 100644
--- a/src/vk/uniform_data_object.hpp
+++ b/src/vk/uniform_data_object.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@
 #define CANDY_GEAR_VK_UNIFORM_DATA_OBJECT_H 1
 
 #include "core.hpp"
+#include "skeletal_mesh_vertex.hpp"
 
 namespace VK
 {
@@ -44,9 +45,15 @@ struct ODOWorld3D_Frag
   glm::vec4 directional_light_color;
 };
 
-struct ODOModelInstance
+struct ODOStaticModel
 {
-  glm::mat4 matrix;
+  glm::mat4 base_matrix;
+};
+
+struct ODOSkeletalModel
+{
+  glm::mat4 base_matrix;
+  glm::mat4 bone_matrices[SKELETAL_MESH_MAX_NUM_OF_BONES];
 };
 
 struct ODOVector4D