Add .webp image output via GPU splat rasterizer#235
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Pull request overview
Adds a new GPU-rendered image output path so splat scenes can be rasterized from a configurable camera and written as lossless WebP. This extends the library’s output formats and introduces a reusable headless renderer (camera basis → BVH frustum culling → tiled GPU compute rasterization) that’s also wired into the CLI.
Changes:
- Add
.webpoutput support viawriteImageand route.webpthrough the high-levelwriteFiledispatcher. - Introduce a new
src/lib/render/pipeline (camera basis, frustum plane generation + BVH query, tiled streaming orchestrator). - Add a new
GpuSplatRasterizerWebGPU compute implementation and extendGaussianBVHwith a frustum-plane query API.
Reviewed changes
Copilot reviewed 15 out of 15 changed files in this pull request and generated 10 comments.
Show a summary per file
| File | Description |
|---|---|
| src/lib/writers/write-image.ts | New writer that renders splats and encodes the result as lossless WebP. |
| src/lib/writers/index.ts | Re-export writeImage and WriteImageOptions. |
| src/lib/write.ts | Add .webp detection and new 'image' output format dispatch. |
| src/lib/types.ts | Add render-related options to the shared Options type. |
| src/lib/spatial/gaussian-bvh.ts | Add queryFrustumRawInto for 6-plane frustum culling into a typed buffer. |
| src/lib/render/tile-stream.ts | New tiled render orchestrator with BVH culling, depth sorting, chunk packing, and 3-slot pipelining. |
| src/lib/render/preprocess.ts | New helpers for SH-band detection, candidate depth sorting, and GPU input packing. |
| src/lib/render/index.ts | Export renderer entry points/types. |
| src/lib/render/camera.ts | New camera + derived basis utility. |
| src/lib/render/bvh-query.ts | New frustum plane generation and BVH query wrapper with buffer growth. |
| src/lib/index.ts | Export the new writer and renderer APIs from the library entry point. |
| src/lib/gpu/index.ts | Export GpuSplatRasterizer and TILE_SIZE. |
| src/lib/gpu/gpu-splat-rasterizer.ts | New WebGPU compute rasterizer (project → accumulate → finalize) with SH evaluation up to band 3. |
| src/cli/index.ts | Add CLI flags for camera/render configuration and update help text to include .webp. |
| README.md | Document .webp output support, new CLI flags, and usage examples. |
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Summary
.webpoutput format that renders the splat scene from a configurable camera using a WebGPU compute rasterizer (project → accumulate → finalize).src/lib/render/(camera basis, frustum-plane BVH query, tile-streaming orchestrator with 3-slot CPU/GPU pipelining) andsrc/lib/gpu/gpu-splat-rasterizer.ts(per-tile compute pipeline, SH evaluation up to band 3).writeImageplus CLI flags:--camera,--look-at,--up,--fov,--resolution,--near,--background. Output is encoded as lossless WebP.GaussianBVHwithqueryFrustumRawIntofor 6-plane frustum culling per tile group.Test plan
npm run buildandnpm run lintpass--resolution 512x512 --camera 2,1,-2 --look-at 0,0,0) and visually inspect the output.webp--background 0,0,0,0) composites as expected