add Merge::transform, Model::merge

src/graphics/commons/Model.cpp

@@ -156,6 +156,12 @@ void Mesh::scale(const glm::vec3& size) {
     }
 }
 
+void Mesh::transform(const glm::mat4& matrix) {
+    for (auto& vertex : vertices) {
+        vertex.coord = matrix * glm::vec4(vertex.coord, 1.0f);
+    }
+}
+
 void Model::clean() {
     meshes.erase(
         std::remove_if(meshes.begin(), meshes.end(), 
@@ -165,3 +171,20 @@ void Model::clean() {
         meshes.end()
     );
 }
+
+void Model::transform(const glm::mat4& matrix) {
+    for (auto& mesh : meshes) {
+        mesh.transform(matrix);
+    }
+}
+
+void Model::merge(const Model& source) {
+    for (const auto& srcMesh : source.meshes) {
+        auto& dstMesh = addMesh(srcMesh.texture, srcMesh.shading);
+        dstMesh.vertices.insert(
+            dstMesh.vertices.end(),
+            srcMesh.vertices.begin(),
+            srcMesh.vertices.end()
+        );
+    }
+}

src/graphics/commons/Model.hpp

@@ -72,6 +72,9 @@ namespace model {
             const glm::mat4& transform
         );
         void scale(const glm::vec3& size);
+
+        /// @brief Apply transformation matrix to vertices coordinates
+        void transform(const glm::mat4& matrix);
     };
 
     struct Model {
@@ -91,5 +94,12 @@ namespace model {
         }
         /// @brief Remove all empty meshes
         void clean();
+
+        /// @brief Apply transformation matrix to vertices coordinates
+        void transform(const glm::mat4& matrix);
+
+        /// @brief Copy or merge meshes from source model to this.
+        /// Does not remove duplicates
+        void merge(const Model& source);
     };
 }