刷新由 PaintContext 高度贴图和 Alpha 贴图修改项创建的延迟操作。
在绘制和雕刻过程中会导致性能问题的昂贵更新将遭到延迟，直到用户完成与这些更新的交互为止。 PaintContext.ScatterAlphamap 创建一个延迟操作来重新构建基础贴图 LOD 纹理。 PaintContext.ScatterHeightmap 创建一个延迟操作以重新构建碰撞、物理、像素误差指标、可见性包围盒以及草、树和细节位置。 ApplyDelayedActions 将立即应用这些延迟的操作。 鼠标按钮弹起并且地形检视面板已关闭 (OnDisable) 时，将调用 ApplyDelayedActions。
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