Path-traced render: a Cornell-box scene with glossy spheres.

// close to the metal · measured · explained

Fakhir Shaheen

C++ engineer and CS professor, going deep on GPU performance and ML kernels.

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Now

~/now last updated 2026-08-12
currently→CPU path tracer — multiple importance sampling done
next→BVH construction + profiling pass
sgemm 4096³ vs cuBLAS71%▲ +6% this week
MIS render, 512spp41.2s▲ 2.3× faster than naive
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Writing

1 entry · more as the work lands
2026-08-09 Multiple importance sampling, measured worklog Why my glossy spheres were noisy at grazing angles — and what a 2.3× variance reduction actually costs per sample.