diff --git a/src/model_physics.rs b/src/model_physics.rs
index 9c50c1a..16de46b 100644
--- a/src/model_physics.rs
+++ b/src/model_physics.rs
@@ -500,7 +500,7 @@ impl MeshQuery<SubmeshFaceId,SubmeshDirectedEdgeId,SubmeshVertId> for Transforme
 	fn face_nd(&self,face_id:SubmeshFaceId)->(Self::Normal,Self::Offset){
 		let (n,d)=self.view.face_nd(face_id);
 		let transformed_n=self.transform.normal*n;
-		let transformed_d=d.fix_4()+transformed_n.dot(self.transform.vertex.translation);
+		let transformed_d=d*self.transform.det+transformed_n.dot(self.transform.vertex.translation);
 		(transformed_n,transformed_d)
 	}
 	fn vert(&self,vert_id:SubmeshVertId)->Planar64Vec3{