fix(cnn_v3): use model matrix for normal transform in gbuf_raster

inv_model applies the inverse rotation → normals pointing inward.
model matrix is correct for uniform-scale objects (matches rotating_cube.wgsl).

1 files changed, 2 insertions, 2 deletions

diff --git a/cnn_v3/shaders/gbuf_raster.wgsl b/cnn_v3/shaders/gbuf_raster.wgsl
index a5eb921..003f501 100644
--- a/cnn_v3/shaders/gbuf_raster.wgsl
+++ b/cnn_v3/shaders/gbuf_raster.wgsl
@@ -60,8 +60,8 @@ fn vs_main(
 
     let world_pos    = obj.model * vec4f(p, 1.0);
     let clip_pos     = globals.view_proj * world_pos;
-    // Transform normal by inverse-transpose (upper-left 3×3 of inv_model^T)
-    let world_normal = normalize((obj.inv_model * vec4f(n, 0.0)).xyz);
+    // Transform normal: use model matrix (correct for uniform scale + rotation).
+    let world_normal = normalize((obj.model * vec4f(n, 0.0)).xyz);
 
     var out: VertexOutput;
     out.position       = clip_pos;