diff --git a/src/integer.rs b/src/integer.rs
index e94d026d..4239dcf2 100644
--- a/src/integer.rs
+++ b/src/integer.rs
@@ -807,6 +807,17 @@ impl std::ops::Mul<Time> for Planar64Vec3{
 		))
 	}
 }
+impl std::ops::Div<Planar64> for Planar64Vec3{
+	type Output=Planar64Vec3;
+	#[inline]
+	fn div(self,rhs:Planar64)->Self::Output{
+		Planar64Vec3(glam::i64vec3(
+			(((self.0.x as i128)<<32)/(rhs.0 as i128)) as i64,
+			(((self.0.y as i128)<<32)/(rhs.0 as i128)) as i64,
+			(((self.0.z as i128)<<32)/(rhs.0 as i128)) as i64,
+		))
+	}
+}
 impl std::ops::Div<i64> for Planar64Vec3{
 	type Output=Planar64Vec3;
 	#[inline]
diff --git a/src/model_physics.rs b/src/model_physics.rs
index a8d18229..d404cba6 100644
--- a/src/model_physics.rs
+++ b/src/model_physics.rs
@@ -272,8 +272,8 @@ impl MeshQuery<FaceId,DirectedEdgeId,VertId> for TransformedMesh<'_>{
 	fn face_nd(&self,face_id:FaceId)->(Planar64Vec3,Planar64){
 		let (n,d)=self.mesh.face_nd(face_id);
 		let transformed_n=*self.normal_transform*n;
-		let transformed_d=self.transform_det*d+transformed_n.dot(self.transform.translation);
-		(transformed_n,transformed_d)
+		let transformed_d=d+transformed_n.dot(self.transform.translation)/self.transform_det;
+		(transformed_n/self.transform_det,transformed_d)
 	}
 	fn vert(&self,vert_id:VertId)->Planar64Vec3{
 		self.transform.transform_point3(self.mesh.vert(vert_id))