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SSSR Resolve 采样Intersection Linear插值错误 #2

@ghost

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SSSR resolve阶段采样Intersection时使用了LinearClamp Sampler,我猜测这里应该使用Point,linear会在粗糙表面临近点插值错误的Hit和Pdf,导致Temporal阶段累积这部分错误结果出现闪烁。

特别是在调整渲染尺寸时会出现短暂的闪烁。改为point后正常。
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