feat: add C11 binding (lightrt_c) for BVH + custom-primitive ray queries#2
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Expose a C11 ABI over MMapGenericBVH so C code can build a BVH and query it
with custom intersection/bounds callbacks in double precision. The BVH stays
fp32 for broad phase; the intersection callback receives the original fp64 ray
(carried through a per-query context), so analytic primitives can be solved at
full double precision (e.g. sub-nm OPL for aspheric lens tracing).
Adds lightrt_c.{h,cc} and builds them into the lightrt library (CMake + meson).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
syoyo
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Jun 29, 2026
feat: add C11 binding (lightrt_c) for BVH + custom-primitive ray queries
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Expose a C11 ABI over MMapGenericBVH so C code can build a BVH and query it with custom intersection/bounds callbacks in double precision. The BVH stays fp32 for broad phase; the intersection callback receives the original fp64 ray (carried through a per-query context), so analytic primitives can be solved at full double precision (e.g. sub-nm OPL for aspheric lens tracing).
Adds lightrt_c.{h,cc} and builds them into the lightrt library (CMake + meson).