Feature request: implement Bounded VNDF Sampling

[tigrazone]

this is pdf file Kenta Eto and Yusuke Tokuyoshi. 2023. Bounded VNDF Sampling for Smith-GGX Reflections with code.

I implemented hvd_ggx_sample_vndf() equivalent of proposed method but I cant understand how to implement pdf calculation function equivalent.
Please help

[NBickford-NV]

Hi @tigrazone ! I'm working on this internally; as you mentioned, the tricky thing is implementing the PDF correctly. We'll have an update to nvpro_core with this soon. Thank you!

[tigrazone]

I implemented it in one reaytracer and make some optimizations