.NET bindings for NVIDIA OptiX built on top of ILGPU, so ray-tracing raygen/miss/hit programs are written and JIT-compiled as ordinary C# - no separate CUDA/OptiX C++ toolchain required.

Copyright (c) 2020-2022 ILGPU Project. All rights reserved.

• An NVIDIA RTX-capable GPU and driver with OptiX support installed.
• The NVIDIA OptiX SDK installed locally (the library resolves nvoptix.dll from the driver at runtime; the SDK is only needed for header/ABI reference during development).
• .NET (see Src/ILGPU.OptiX/ILGPU.OptiX.csproj for the exact target frameworks).

using var context = Context.Create(b => b.Cuda());
using var accelerator = context.CreateCudaAccelerator(0);
using var rt = OptixRayTracer.Create(accelerator);

using var pipeline = rt.CreatePipeline<LaunchParams>(b => b
    .Raygen(RenderFrame)
    .RayType("radiance", r => r
        .Payload<RadiancePayload>()
        .Miss(MissRadiance)
        .HitGroup<MaterialData>(closestHit: ClosestHitRadiance))
    .MaxTraceDepth(2));

pipeline.SetHitRecords<MaterialData>(materials);
pipeline.Launch(launchParams, width, height);

OptixRayTracer and RayTracingPipeline<T> (in ILGPU.OptiX.Pipeline) own the module/pipeline compile options, SBT record packing, stack size computation, and a persistent launch-params buffer, so a working pipeline no longer requires hand-picked compile-option structs, hand-measured SBT record sizes, or magic stack-size numbers. The lower-level APIs these are built on (CreateModule, CreateProgramGroup, raw OptixShaderBindingTable, etc.) remain public for cases the facade doesn't cover yet.

Samples/Sample01 through Samples/Sample15 are a tutorial progression from "initialize the library" through a full interactive PBR path tracer, each adding one concept (acceleration structures, textures, multiple ray types, denoising, instancing, curves). See tutorials/readme.md for the walkthroughs written so far.