# fogleman/pt

A path tracer written in Go.

Repository: https://github.com/fogleman/pt
Canonical: https://ross.abutalabs.com/products/pt
Language: Go
License: MIT
License Family: permissive
Last push: 2019-03-21T10:07:26+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4240, "days_push": 2722, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2102, forks 107 (observed 2026-08-28T04:06:13.726257+00:00)

## What it is
A CPU-only unidirectional path tracing engine written in pure Go with a simple API. It supports OBJ/STL meshes, textures, SDF raymarching, volume rendering, and parallel rendering across all CPU cores.

## Use cases
- render photorealistic 3d images with path tracing
- render obj and stl models offline
- raymarch signed distance fields
- volume render from image slices
- learn how a path tracer works in go

## When to choose
- you want a dependency-free pure Go renderer
- you need CPU-based physically-based rendering with a simple API
- you want to experiment with path tracing techniques like adaptive sampling

## When to avoid
- you need GPU-accelerated real-time rendering
- you need a full production 3D pipeline with animation
- you need actively maintained software with recent releases

## Facets
- artifact type: library
- maturity: maintenance
- function: graphics, simulation, image-processing
- domain: graphics, developer-tools
- platform: go, cross-platform, cli
- tags: path-tracing, ray-tracing, rendering, cpu-renderer, physically-based-rendering, 3d-graphics, game-development

## Member repositories
- fogleman/pt (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:13.726257+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 2026-08-30T02:54:16.638606+00:00, confidence not recorded.
  - readme: https://github.com/fogleman/pt (fetched 2026-08-28T04:06:13.726257+00:00, sha 0880865f6b9a)
- Data as of 2026-08-30T08:39:29.467469+00:00.