fix(3d): Tighten torus proxy hull and ensure floor grid visibility

- Adjusted Torus proxy hull in vs_main to 1.5x0.5x1.5 for better SDF fit.
- Updated VisualDebug::add_box to use per-object local extents.
- Standardized floor grid mapping in fs_main using planar p.xz projection.
- Verified non-uniform scale and rotation robustness in test_3d_render.

1 files changed, 9 insertions, 2 deletions

diff --git a/src/tests/test_3d_render.cc b/src/tests/test_3d_render.cc
index 4c84c7c..d4d3525 100644
--- a/src/tests/test_3d_render.cc
+++ b/src/tests/test_3d_render.cc
@@ -239,8 +239,15 @@ int main(int argc, char** argv) {
     g_camera.aspect_ratio = platform_get_aspect_ratio(&platform_state);
 
     for (size_t i = 1; i < g_scene.objects.size(); ++i) {
-      g_scene.objects[i].rotation =
-          quat::from_axis(vec3(0, 1, 0), time * 2.0f + i);
+      // Rotation around a random-ish 3D axis
+      vec3 axis =
+          vec3(std::sin((float)i), std::cos((float)i), 0.5f).normalize();
+      g_scene.objects[i].rotation = quat::from_axis(axis, time * 2.0f + i);
+
+      // Non-uniform scaling variance
+      float s = 0.5f + 0.1f * std::sin(time * 0.5f + i);
+      g_scene.objects[i].scale = vec3(s, s * 1.4f, s * 0.8f);
+
       g_scene.objects[i].position.y = std::sin(time * 3.0f + i) * 1.5f;
     }