fix: Correct mesh normal transformation and floor shadow rendering

1 files changed, 4 insertions, 5 deletions

diff --git a/assets/final/shaders/mesh_render.wgsl b/assets/final/shaders/mesh_render.wgsl
index 3759747..3faf7ca 100644
--- a/assets/final/shaders/mesh_render.wgsl
+++ b/assets/final/shaders/mesh_render.wgsl
@@ -33,10 +33,9 @@ fn vs_main(in: VertexInput, @builtin(instance_index) instance_index: u32) -> Ver
     out.clip_pos = globals.view_proj * world_pos;
     out.world_pos = world_pos.xyz;
     
-    // Normal transform (assuming uniform scale or using transpose(inverse(model)))
-    // For simplicity, we use the same mat3 logic as renderer_3d.wgsl
-    let normal_matrix = mat3x3<f32>(obj.model[0].xyz, obj.model[1].xyz, obj.model[2].xyz);
-    out.normal = normalize(normal_matrix * in.normal);
+    // Use transpose of inverse for normals
+    let normal_matrix = mat3x3<f32>(obj.inv_model[0].xyz, obj.inv_model[1].xyz, obj.inv_model[2].xyz);
+    out.normal = normalize(transpose(normal_matrix) * in.normal);
     
     out.uv = in.uv;
     out.color = obj.color;
@@ -56,4 +55,4 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
     let lit_color = calculate_lighting(in.color.rgb, in.normal, in.world_pos, shadow);
     
     return vec4<f32>(lit_color, in.color.a);
-}
+}
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