unable to shade polygon normals

src/main/kotlin/Game.kt

@@ -244,7 +244,7 @@ class Game: ApplicationAdapter()
 			.rotate(0.0f, 1.0f, 0.0f, jolkRot)
 			.scale(0.25f, 0.25f, 0.25f)
 		cubeInstance.transform = world
-		knux.transform.rotate(rand.nextQuaternion().slerp(Quaternion(), 0.9f))
+		knux.transform.rotate(Quaternion().slerp(rand.nextQuaternion(), deltaTime))
 
 		modelBatch.begin(colin.camera)
 		modelBatch.render(floorInstance, env)