# nv-tlabs/3dgrut

Ray tracing and hybrid rasterization of Gaussian particles

Repository: https://github.com/nv-tlabs/3dgrut
Canonical: https://ross.abutalabs.com/products/3dgrut
Language: Python
License: Apache-2.0
License Family: permissive
Topics: 3d-reconstruction, computer-vision, gaussian-splatting, ray-tracing
Last push: 2026-08-19T22:39:15+00:00

## Health v2 (maintenance only)
Score: 71/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 55, longevity 38
- inputs: {"age_days": 532, "days_push": 14, "days_rel": 84, "gap_med": 433, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2390, forks 278 (observed 2026-08-28T04:06:43.308712+00:00)

## What it is
NVIDIA's official implementations of 3D Gaussian Ray Tracing (3DGRT) and 3D Gaussian Unscented Transform (3DGUT), which render volumetric Gaussian particles via ray tracing, rasterization, or a hybrid of both. It supports distorted cameras, time-dependent effects like rolling shutters, and secondary ray effects such as reflections, refraction, and shadows.

## Use cases
- render 3d gaussian splatting scenes with ray tracing
- train gaussian splatting models with distorted fisheye cameras
- handle rolling shutter effects in 3d reconstruction
- render reflections and shadows in gaussian splat scenes
- hybrid rasterization and ray tracing of particle scenes
- reconstruct 3d scenes from video with rolling shutter

## When to choose
- you need secondary ray effects like reflections, refraction, or shadows with gaussian splatting
- your capture cameras have distortion or rolling shutter artifacts
- you have NVIDIA RTX hardware and want research-grade gaussian ray tracing
- you want to combine rasterization speed with ray tracing flexibility

## When to avoid
- you need a fast, production-ready general gaussian splatting framework - use gsplat instead as the authors recommend
- you lack dedicated ray-tracing GPU hardware and only need basic splatting
- you need a plug-and-play viewer rather than a research codebase

## Facets
- artifact type: library
- maturity: active
- function: graphics, computer-vision, image-processing, simulation
- domain: computer-vision, graphics, machine-learning
- platform: python, windows
- tags: gaussian-splatting, ray-tracing, 3d-reconstruction, neural-rendering, nvidia, cuda, siggraph, gpu, linux

## Member repositories
- nv-tlabs/3dgrut (main) score 71

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:43.308712+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:34:30.313702+00:00, confidence not recorded.
  - readme: https://github.com/nv-tlabs/3dgrut (fetched 2026-08-28T04:06:43.308712+00:00, sha ea65f94952ae)
- Data as of 2026-08-30T08:39:29.467469+00:00.