fix: Correct mesh normal transformation and floor shadow rendering

1 files changed, 5 insertions, 1 deletions

diff --git a/src/3d/object.h b/src/3d/object.h
index a7ce0b8..3d4ff35 100644
--- a/src/3d/object.h
+++ b/src/3d/object.h
@@ -40,12 +40,14 @@ class Object3D {
   bool is_static;
 
   AssetId mesh_asset_id;
+  vec3 local_extent; // Half-extents for AABB (used by meshes for shadows)
   void* user_data; // For tool-specific data, not for general use
 
   Object3D(ObjectType t = ObjectType::CUBE)
       : position(0, 0, 0), rotation(0, 0, 0, 1), scale(1, 1, 1), type(t),
         color(1, 1, 1, 1), velocity(0, 0, 0), mass(1.0f), restitution(0.5f),
-        is_static(false), mesh_asset_id((AssetId)0), user_data(nullptr) {
+        is_static(false), mesh_asset_id((AssetId)0), local_extent(1, 1, 1), 
+        user_data(nullptr) {
   }
 
   mat4 get_model_matrix() const {
@@ -61,6 +63,8 @@ class Object3D {
   BoundingVolume get_local_bounds() const {
     if (type == ObjectType::TORUS)
       return {{-1.5f, -0.5f, -1.5f}, {1.5f, 0.5f, 1.5f}};
+    if (type == ObjectType::MESH)
+      return {-local_extent, local_extent};
     // Simple defaults for unit primitives
     return {{-1, -1, -1}, {1, 1, 1}};
   }