Some commit

src/model/mod.rs

@@ -374,6 +374,20 @@ impl Model {
         }
     }
 
+    /// Creates only non-existant vertex buffers, doesn't update the old ones.
+    pub fn build_new_vertex_buffers(&mut self, renderer: &Renderer) {
+        for part in &mut self.parts {
+            if part.vertex_buffer.is_none() {
+                Model::build_vertex_buffer_for_part(
+                    &self.vertices,
+                    &self.texture_coordinates,
+                    &self.normals,
+                    part,
+                    renderer);
+            }
+        }
+    }
+
     /// Creates a vertex buffer that can be rendered for a part of the model.
     pub fn build_vertex_buffer_for_part(
         vertices: &Vec<Vector3<f64>>,
@@ -429,4 +443,9 @@ impl Model {
     pub fn get_texture_by_name(&self, name: &str) -> Option<&SrgbTexture2d> {
         self.textures[name].as_ref()
     }
+
+    /// Returns a ref mut to the table of textures.
+    pub fn textures_mut(&mut self) -> &mut HashMap<String, Option<SrgbTexture2d>> {
+        &mut self.textures
+    }
 }