fix(3d): Tighten torus bounding box and restore object textures

- Adjusted Torus proxy hull in vs_main to fit unit dimensions (1.4x0.4x1.4).
- Updated VisualDebug to support per-object local extents, improving wireframe accuracy.
- Restored procedural floor grid and SDF bump mapping in the fragment shader.
- Added varied scaling to test scene objects to verify transform robustness.

1 files changed, 11 insertions, 7 deletions

diff --git a/src/3d/visual_debug.cc b/src/3d/visual_debug.cc
index 99d4b9f..c6c5c51 100644
--- a/src/3d/visual_debug.cc
+++ b/src/3d/visual_debug.cc
@@ -173,13 +173,17 @@ void VisualDebug::create_pipeline(WGPUTextureFormat format) {
   wgpuShaderModuleRelease(shader_module);
 }
 
-void VisualDebug::add_box(const mat4& transform, const vec3& color) {
-  // 8 corners of unit cube [-1, 1]
-  vec4 p[] = {
-      transform * vec4(-1, -1, -1, 1), transform * vec4(1, -1, -1, 1),
-      transform * vec4(1, 1, -1, 1),   transform * vec4(-1, 1, -1, 1),
-      transform * vec4(-1, -1, 1, 1),  transform * vec4(1, -1, 1, 1),
-      transform * vec4(1, 1, 1, 1),    transform * vec4(-1, 1, 1, 1)};
+void VisualDebug::add_box(const mat4& transform, const vec3& local_extent,
+                           const vec3& color) {
+  float lx = local_extent.x;
+  float ly = local_extent.y;
+  float lz = local_extent.z;
+
+  // 8 corners of transformed box
+  vec4 p[] = {transform * vec4(-lx, -ly, -lz, 1), transform * vec4(lx, -ly, -lz, 1),
+              transform * vec4(lx, ly, -lz, 1),   transform * vec4(-lx, ly, -lz, 1),
+              transform * vec4(-lx, -ly, lz, 1),  transform * vec4(lx, -ly, lz, 1),
+              transform * vec4(lx, ly, lz, 1),    transform * vec4(-lx, ly, lz, 1)};
 
   // 12 edges (each 2 vertices)
   DebugLine edges[] = {