From 7d60a8a9ece368e365b5c857600004298cb89526 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Fri, 6 Feb 2026 08:46:20 +0100
Subject: fix: Correct mesh normal transformation and floor shadow rendering

---
 src/3d/object.h    | 6 +++++-
 src/3d/renderer.cc | 6 ++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

(limited to 'src/3d')

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}};
   }
diff --git a/src/3d/renderer.cc b/src/3d/renderer.cc
index a9beffe..eea3ff0 100644
--- a/src/3d/renderer.cc
+++ b/src/3d/renderer.cc
@@ -174,7 +174,7 @@ void Renderer3D::update_uniforms(const Scene& scene, const Camera& camera,
       type_id = 4.0f;
     else if (obj.type == ObjectType::MESH)
       type_id = 5.0f;
-    data.params = vec4(type_id, 0, 0, 0);
+    data.params = vec4(type_id, obj.local_extent.x, obj.local_extent.y, obj.local_extent.z);
     obj_data.push_back(data);
     if (obj_data.size() >= kMaxObjects)
       break;
@@ -303,9 +303,11 @@ void Renderer3D::draw(WGPURenderPassEncoder pass, const Scene& scene,
 #if !defined(STRIP_ALL)
   if (s_debug_enabled_) {
     for (const auto& obj : scene.objects) {
-      vec3 extent(1.0f, 1.0f, 1.0f);
+      vec3 extent = obj.local_extent;
       if (obj.type == ObjectType::TORUS) {
         extent = vec3(1.5f, 0.5f, 1.5f);
+      } else if (obj.type != ObjectType::MESH) {
+        extent = vec3(1.0f, 1.0f, 1.0f);
       }
       visual_debug_.add_box(obj.get_model_matrix(), extent,
                             vec3(1.0f, 1.0f, 0.0f)); // Yellow boxes
-- 
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