RINDR

Your local 3D file viewer – with real-time path tracing, right in the browser.

STEP · glTF/GLB · FBX · MAX · C4D · Blender · OBJ · 3MF · USD · STL · PLY · IFC · BCF · Gaussian splats (PLY/SOG) · MaterialX · HDRI (HDR/EXR)

Drop a CAD model, a mesh, a BIM file or a Gaussian splat into the window and get a studio-quality render in seconds. Everything runs locally on your GPU – no upload, no server, no install.

Highlights

• Path tracing in real time (WebGPU) – fast preview while you orbit, physically based rendering with AI denoising as soon as the camera stands still.
• Opens almost anything
  • STEP via a custom CAD kernel: assemblies, colours, instancing, adjustable tessellation quality
  • glTF/GLB, FBX, STL, PLY, OBJ (own reader for files of hundreds of MB, MTL materials)
  • MAX (.max) via an own reader: Editable Mesh/Poly, primitives, text and splines, common modifiers (Extrude, Shell, Bend, FFD, TurboSmooth …), instances, Physical Materials
  • C4D (.c4d) via an own reader: polygon objects with UVs and phong smoothing, joints and weights (skinning), keyframe animation, materials with colour and normal maps
  • Blender (.blend) via an own reader on the file's self-description: meshes, Principled BSDF materials with packed textures, cameras (modifiers not evaluated)
  • 3MF via an own reader: assemblies and instances, multi-part slicer projects, colours and textures
  • USD (.usd/.usda/.usdc/.usdz): multi-file scenes with references, payloads and sublayers, shared geometry for referenced assets
  • IFC (BIM) incl. properties, BCF issues
  • MaterialX (.mtlx) with OpenPBR: materials in and out – a material as a package with textures, glTF sphere and preview
  • Gaussian splats (PLY, SOG)
• Node-based materials (three.js TSL) and a material library – drag & drop onto parts in the viewport or the scene graph; UV mapping per object (box, planar, cylinder, sphere).
• Special materials – toon and contour styles, subsurface scattering (jelly, wax), glowing marble, a cloud as real volume, wool with fibres, grass with real blades, soap bubbles with thin-film colours; scattering media for cloudy liquids – juice, milk, honey, beer and more in the library.
• Studio tools – scene graph with hover outlines, move/rotate/scale gizmo, MAX-style quad menu, view cube, animated exploded view, section plane, animations with skeleton view.
• Lighting – HDRI environments (drop your own .hdr/.exr into the window) with a flattened ground dome, shadow catcher and contact shadows, ground reflections and rain puddles; an HDRI editor for your own procedural environments with sun & sky and movable light pins.
• Camera like a real lens – depth of field with bokeh blades, fisheye up to 240°, bloom, glare, lens flare and volumetric god rays; style filters from pixel art and scanlines to sketch and ASCII.
• Distributed rendering – other computers in your local network render along (paired via link and code, peer-to-peer), buckets labelled per computer.
• Output – image export (incl. transparent PNG), light passes per light source and light type plus helper passes (alpha, depth, normals, albedo, IDs) as layered EXR or PSD, save/load whole scenes, and AI rendering: send the frame plus your material names to an image model for a photoreal take.
• English and German UI.

Browser: needs WebGPU – current Chrome or Edge recommended. Large models load in parallel with shared memory (cross-origin isolation): via COOP/COEP headers on your own server (public/.htaccess), on static hosting like GitHub Pages a small service worker takes care of it.

License

Free for non-commercial use – private, education, research, non-profit – under the PolyForm Noncommercial License 1.0.0: use, change and share it.

RINDR stands on the shoulders of open-source projects. That's why commercial use needs a license: whatever it brings in goes back to open-source projects.

The open-source libraries below keep their own licenses.

Built with

RINDR is built on great open-source projects. Thanks to everyone who contributes to them!

In the viewer

Project	Used for	License
three.js	3D engine, WebGPU renderer, glTF/FBX/STL loaders	MIT
three-gpu-pathtracer	GPU path tracing (HQ)	MIT
three-mesh-bvh	Acceleration structures for raycasting and path tracing	MIT
Intel Open Image Denoise	AI denoising (weights)	Apache-2.0
oidn-web	Open Image Denoise in the browser	MIT
@pmndrs/upscaler	Upscaling (AMD FSR)	MIT
earcut	Triangulation of STEP faces	ISC
cdt2d	Delaunay triangulation (fallback)	MIT
polygon-clipping	Repair of crossing face boundaries	MIT
robust-predicates	Exact geometric predicates	Unlicense
robust-orientation, robust-in-sphere, binary-search-bounds	Exact geometric predicates for cdt2d	MIT

HDRI environments

Project	Used for	License
Open HDRI	HDRI maps for lighting and background	CC0

For building

Project	Used for	License
Astro	Web framework	MIT
Vite	Build tool	MIT
Tailwind CSS	CSS framework	MIT

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