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user 4546
7
votes
Accepted
Path tracer - multi layered materials and importance sampling
Wenzel Jakob et al presented a framework for layered Materials at SIGGRAPH 2014. Section 6.2 explains importance sampling. If you prefer code over equations, the method is implemented in the Mitsuba r …
- 706
4
votes
Accepted
Ray tracing - partial derivatives for texture lookup
Yes, ray differentials are the way to go. The Paper by Igehy introduces them for the use case of filtered texture lookups. When generating the primary rays, you initialise the differentials to reflect …
- 706