feat(3d): Support non-uniform scale and shadows on rasterized objects

- Implemented full support for non-uniform scaling by calculating and passing the 'model_inverse_transpose' matrix to the shader for correct normal transformation.
- Added 'transpose()' and 'inverse()' methods to the 'mat4' class in 'mini_math.h'.
- Refactored the shader to use the new matrix for lighting rasterized objects.
- Updated the test scene to use a rasterized floor (CUBE) instead of an SDF one, ensuring it receives correct lighting and shadows even with non-uniform scale.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/3d/renderer.h b/src/3d/renderer.h
index c4fec06..43e7cfe 100644
--- a/src/3d/renderer.h
+++ b/src/3d/renderer.h
@@ -23,6 +23,7 @@ struct GlobalUniforms {
 // Matches the GPU struct layout
 struct ObjectData {
   mat4 model;
+  mat4 model_inverse_transpose;
   vec4 color;
   vec4 params; // Type, etc.
 };