Dont reload textures if some already exist

src/model/mod.rs

@@ -545,9 +545,11 @@ impl Model {
     /// Builds the SrgbTextures for rendering.
     pub fn build_texture_for_material(&mut self, material: &Material, renderer: &Renderer) {
         if let Some((path, _)) = material.textures.get("map_Kd") {
+            if ! self.textures.contains_key(path) {
                 let texture = renderer.make_texture(path);
                 // Don't need to insert multiple times the same texture
                 self.textures.entry(path.to_owned()).or_insert(Rc::new(texture));
+            }
         };
     }