如何彻底摆脱暗疮和错误的自我遮盖？ [英] How to get completely rid of shadow acne and erroneous self shadowing?
问题描述
我正在做简单阴影映射，在处理阴影粉刺和错误的自阴影方面遇到了问题，无法解决。
我已经尝试过向深度值添加偏差并向深度缓冲区渲染背面，但是并不能消除所有伪像。
我也很难选择导致彼得·潘宁（Peter Panning）的正确偏见。
I'm doing Simple Shadow Mapping and have problems with handling shadow acne and erroneous self shadowing and just can't get rid of it. I already tried adding a bias to the depth value and rendering back faces to the depth buffer, but it doesn't remove all artifacts. I also have problems choosing the right bias which leads to Peter Panning.
所以我的问题是：
-
是否有一种健壮（简便）的方法可以完全消除暗疮和错误的自阴影？
Is there a robust (and easy) way to completely eliminate shadow acne and erroneous self shadowing?
如何选择理想偏差？
推荐答案
有一种称为方差阴影贴图的技术，该技术受其自身特有的影响，但非常擅长消除暗疮和错误的自我遮盖。
There's a technique called variance shadow maps which is subject to its own peculiar artifacts, but which is very good at eliminating shadow acne and erroneous self-shadowing. It was designed as a nonlinear filter for shadow maps, to avoid jaggies due to low resolution.
简而言之，它估计深度图的方差，并使用它来查找阴影图。对阴影与深度的平滑保守估计。您需要注意缓冲区的精度，因为大多数实现似乎都是通过滥用动态范围的方式来评估方差。
Briefly, it estimates the variance of the depth map, and uses that to find a smooth, conservative estimate of shadowing vs. depth. You need to be careful about buffer precision, as most implementations seem to evaluate the variance in ways that abuse their dynamic range.
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