| terrain | 激活的地形对象。 |
| editContext | 用于在编辑器和画笔工具之间进行通信的接口。 |
bool 返回 true 表示暂时隐藏地形上的树、草和细节层。
自定义地形工具绘制回调。
当按下或拖动鼠标按钮时（这通常是在工具应用其修改时），Unity 会调用此方法。
有些工具可能会想要在 OnSceneGUI 中以自定义的绘制逻辑来应用它们的修改。
当方法返回 true 时，不会渲染地形上的层，例如树、草和其他细节层。
另请参阅：PaintContext
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