| bias | 恒定深度偏差。 |
| slopeBias | 依赖于斜率的深度偏差。 |
添加用于设置全局深度偏差的命令。
将全局深度偏差添加至在着色器中指定的状态（请参阅 cull and depth state）。这通常在 渲染阴影投射物体时很有用，可将其略微推离光源，以防产生阴影暗斑。在渲染阴影投射物时， Unity 中内置的阴影投射物渲染将全局深度偏差设置为 (1.0, 1.0)。
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