Lecture 13: Global Illumination & Path Tracing (107)
CallipolisLin

I understand why floating-point precision would cause the computed surface intersection to have an extra shadow ray. Just curious, would the computed surface intersection lie above the surface (not having any real intersections)? And if so, what would be the consequences?

rishiu

The computed surface intersection could also be above the surface. The consequences of this would vary by the scene, but it could affect the angle to the lighting or to other objects and therefore affect what the surface looks like.

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