阴影贴图基于法线的偏差。
阴影投射物表面会按照此量沿其法线向内推动,以帮助防止出现自我阴影(“阴影暗斑”)瑕疵。基于法线的偏差的单位按阴影贴图纹理像素大小进行表示;通常介于 0.3-0.7 之间的值可工作良好。
较大值可更好地防止阴影暗斑,代价是使阴影形状小于对象的实际形状。
当前仅针对方向光实现基于法线的偏差;它对其他光源类型不起作用。
另请参阅:shadows、shadowBias 属性。
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