Let me ask you one more question. Is it possible to paint plants with EDITOR in urp environment? The paint at runtime works, but it doesn't seem to work with EDITOR. The error was something like this // UnassignedReferenceException: The variable GrassMaterials of InfiniGRASSManager has not been assigned. You probably need to assign the GrassMaterials variable of the InfiniGRASSManager script in the inspector.