不透明对象的排序模式。
不透明对象是按多种条件进行排序(排序层、着色器队列、
材质、距离、光照贴图等),目的是最大程序地提高 CPU 效率(减少状态更改数
并改进绘制调用批处理)和 GPU 效率
(很多 GPU 首选粗略的从前到后渲染顺序,以便更快地剔除不可见
表面)。
默认情况下,在使用这种方式有利的 GPU 上,不透明对象分组为
粗略的从前到后存储桶。在某些 GPU 上,执行这种基于距离的
排序没有实际帮助(最明显的就是 PowerVR/Apple GPU),因此在这些 GPU 上,
不默认使用这种基于距离的排序。
使用 Camera.opaqueSortMode 属性可以重写此默认行为。
例如,如果对 CPU 性能的要求远高于 GPU 性能,
可能就不希望对不透明对象执行基于距离的排序。
另请参阅:OpaqueSortMode 枚举、transparencySortMode。
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