fix(3d): Resolve spherical distortion in floor grid texture

- Corrected world-space position calculation in SDF fragment shader.
- Transformed local hit point back to world space using the model matrix.
- Restored accurate planar p.xz mapping for the floor grid.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/3d/renderer.cc b/src/3d/renderer.cc
index abd26de..8676db4 100644
--- a/src/3d/renderer.cc
+++ b/src/3d/renderer.cc
@@ -212,8 +212,8 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
         }
         if (!hit) { discard; }
         
-        p = ro_world + rd_world * t; // Use world t for final position
         let q_hit = ro_local + rd_local * t;
+        p = (obj.model * vec4<f32>(q_hit, 1.0)).xyz; // Correct world position
         
         // Calculate normal with bump mapping
         let e = vec2<f32>(0.005, 0.0);