feat(scene): integrate standard DWG data

src/io/mod.rs

@@ -172,7 +172,11 @@ pub async fn open_path_with_phase(
                         10000,
                     );
                 };
-                let mut caches = crate::scene::build_derived_caches_with_progress(&doc, &cache_progress);
+                let mut caches = crate::scene::build_derived_caches_with_progress(
+                    &doc,
+                    &cache_progress,
+                    path2.parent(),
+                );
         caches.timings = crate::scene::OpenTimings {
             parse_ms,
             purge_ms,

src/io/obj.rs

@@ -106,6 +106,8 @@ pub fn parse_obj(src: &str, color: [f32; 4]) -> Option<MeshModel> {
         verts_low: Vec::new(),
         normals: norms,
         indices,
+        triangle_material_handles: Vec::new(),
+        triangle_colors: Vec::new(),
         color,
         selected: false,
     })