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NeuralVerified/
neural-raytracing

Name: neural-raytracing
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Neural Ray Tracing — Radiance Cache

The light-transport analog of the neural physics engine thesis: keep visibility and direct lighting analytic, learn only the indirect transport with a tiny tied MLP. One analytic ray + next-event estimation + a network lookup replaces the many-bounce random walk after the first hit.

How it was done

Render decomposition: L = emitted + direct(analytic) + indirect(learned).

Ground truth: a small PyTorch path tracer (engine3d/raytrace.py) renders high-spp references and splits each pixel into emitted / direct / indirect components.
Training data: first-hit surface points + normals paired with the path-traced indirect radiance at those points.
The cache (engine3d/neural_rt.py): one tiny MLP shared across the whole scene (the tied-embedding structure used everywhere in this project) maps (hit point, normal) → indirect RGB.
Composition: at render time, trace one analytic primary ray, add analytic direct lighting (NEE), and look up the cache for the rest.
Evaluation (experiments/w9_neural_radiance_cache.py): PSNR on a held-out camera view, compared against an equal-cost few-spp path trace, plus the spp the baseline needs to match the neural render.

experiments/w11_world_lighting.py applies the same recipe to bake a world ambient/GI field (world_light.pt) over the voxel world — this is the "neural GI" used live in the Neural World demo Space, parsed in-browser by pt_loader.js.

Checkpoints

file	net	consumed by
`experiments/radiance_cache.pt`	indirect radiance cache MLP	`w9_neural_radiance_cache.py` renders
`experiments/world_light.pt`	world ambient/GI field	Neural World demo (browser)

Validation

Reproduce

python experiments/w9_neural_radiance_cache.py   # trains + renders comparison
python experiments/w11_world_lighting.py         # bakes world_light.pt

Now hosted by NeuralVerified.

This repo was moved into the NeuralVerified organization to help organize my profile. Originally published at Quazim0t0/neural-raytracing.

NeuralVerified/neural-raytracing