diff --git a/experiments/2024-10-30/src/render.rs b/experiments/2024-10-30/src/render.rs
index c36b07ef5..749f4f394 100644
--- a/experiments/2024-10-30/src/render.rs
+++ b/experiments/2024-10-30/src/render.rs
@@ -241,12 +241,17 @@ impl Renderer {
 #[repr(C)]
 pub struct Uniforms {
     pub transform: Mat4,
+    pub transform_for_normals: Mat4,
 }
 
 impl Default for Uniforms {
     fn default() -> Self {
         let transform = default_transform();
-        Self { transform }
+        let transform_for_normals = transform.inverse().transpose();
+        Self {
+            transform,
+            transform_for_normals,
+        }
     }
 }
 
diff --git a/experiments/2024-10-30/src/shader.wgsl b/experiments/2024-10-30/src/shader.wgsl
index 7179e90e0..cd80cc789 100644
--- a/experiments/2024-10-30/src/shader.wgsl
+++ b/experiments/2024-10-30/src/shader.wgsl
@@ -1,5 +1,6 @@
 struct Uniforms {
     transform: mat4x4<f32>,
+    transform_for_normals: mat4x4<f32>,
 };
 
 @group(0) @binding(0)