# Renderloom

> Shape a scene. Find its light. Keep every idea editable. Renderloom is a free local 3D scene and material studio. Arrange editable solids, save camera shots, compare light rigs and render six diagnostic passes with the shared Kerfwise concept renderer. Texture Lab turns local images into height, normal, roughness, occlusion and metalness maps for compatible 3D applications; Figure Lab, shared with Panelcraft, adds original stylized parametric figures, and Voxel Desk builds colorful models on a three-dimensional grid. Save editable scenes, texture recipes, rendered PNG/SVG images and OBJ/STL geometry without an account.

Renderloom (3D scene & material studio) is a premium app of usefulweb.app (https://usefulweb.app/): a full program that runs in the browser. Its engine is deterministic and the same functions are exposed as tools, so an agent can compute exactly what the app shows.

## Use it
- Landing page: https://renderloom.usefulweb.app/
- Workspace (browser app): https://renderloom.usefulweb.app/app - open a project with https://renderloom.usefulweb.app/app#project=<base64url-encoded project JSON> or a template with https://renderloom.usefulweb.app/app#template=<id>
- Project file format (JSON Schema): https://renderloom.usefulweb.app/project.schema.json
- Tutorials: https://renderloom.usefulweb.app/tutorials
- JSON API: POST https://renderloom.usefulweb.app/api/v1/tools/<toolId>/calculate (catalog: https://renderloom.usefulweb.app/api/v1/tools)
- OpenAPI: https://renderloom.usefulweb.app/openapi.json
- MCP (Streamable HTTP): https://renderloom.usefulweb.app/mcp

## Engine tools
- [Voxel Height Grid Builder](https://renderloomvoxelheightgrid.usefulweb.app/): Build an editable voxel model from rows of integer heights. API: POST https://renderloom.usefulweb.app/api/v1/tools/renderloom-voxel-height-grid/calculate · MCP tool `renderloom_voxel_height_grid`
- [Voxel Model Inspector](https://renderloomvoxelinspector.usefulweb.app/): Inspect a native voxel model and export its surface mesh. API: POST https://renderloom.usefulweb.app/api/v1/tools/renderloom-voxel-inspector/calculate · MCP tool `renderloom_voxel_inspector`
- [Scene Light Rig Comparison](https://renderloomlightrigs.usefulweb.app/): Compare four deterministic light rigs on the same 3D concept. API: POST https://renderloom.usefulweb.app/api/v1/tools/renderloom-light-rigs/calculate · MCP tool `renderloom_light_rigs`
- [Height Grid to Material Maps](https://renderloomheightmaterial.usefulweb.app/): Turn numeric height samples into normal, roughness, cavity and ORM maps. API: POST https://renderloom.usefulweb.app/api/v1/tools/renderloom-height-material/calculate · MCP tool `renderloom_height_material`
- [Texture Tile Seam Checker](https://renderloomtileseam.usefulweb.app/): Measure opposite-edge jumps and feather a reusable numeric texture tile. API: POST https://renderloom.usefulweb.app/api/v1/tools/renderloom-tile-seam/calculate · MCP tool `renderloom_tile_seam`
- [3D Scene and Render Pass Preview](https://kerfwisescenepreview.usefulweb.app/): Light a Kerfwise concept and inspect beauty, color, normals, depth and object IDs. API: POST https://renderloom.usefulweb.app/api/v1/tools/kerfwise-scene-preview/calculate · MCP tool `kerfwise_scene_preview`
- [Render Sampling Budget](https://kerfwiserenderbudget.usefulweb.app/): Compare image size, sample workload and a simple sampling-noise estimate. API: POST https://renderloom.usefulweb.app/api/v1/tools/kerfwise-render-budget/calculate · MCP tool `kerfwise_render_budget`
- [Footprint to 3D Solid Extruder](https://kerfwiseprofileextruder.usefulweb.app/): Turn a simple footprint into a closed 3D solid with OBJ, STL and editable geometry. API: POST https://renderloom.usefulweb.app/api/v1/tools/kerfwise-profile-extruder/calculate · MCP tool `kerfwise_profile_extruder`
- [3D Form Model Report & Export](https://kerfwisemodelreport.usefulweb.app/): Measure a form model by tag and export its geometry as OBJ or STL. API: POST https://renderloom.usefulweb.app/api/v1/tools/kerfwise-model-report/calculate · MCP tool `kerfwise_model_report`

## Formats
- Import: Voxel project JSON, VOX 150 (single opaque model subset), Renderloom scene JSON, Kerfwise Render Desk recipe JSON, Kerfwise Form Studio JSON, PNG/JPEG/WebP texture source, Renderloom material JSON, Figure project JSON in Figure Lab
- Export: Voxel project JSON, Single-model VOX 150, Voxel preview SVG/PNG, Voxel OBJ with MTL colors, Renderloom scene JSON, PNG render, Image-based SVG render, Print/PDF, Light comparison SVG, Kerfwise render recipe JSON, Kerfwise Form Studio JSON, OBJ mesh (mm), STL mesh (mm), Plan SVG, Texture map PNG, Renderloom material JSON

## Limits
- At most 128 solids and 4096 visible triangles; page renders allow 384000 pixels and 6 million pixel samples.
- Orthographic concept rendering only: no path tracing, glass, arbitrary mesh import, EXR or distributed rendering.
- Texture maps export separately; the renderer supports source colors and three simple finishes.
- Figures are stylized reference solids without anatomical guarantees, skinning or animation rigs.
- OBJ/STL exports keep separate overlapping solids; they do not perform boolean unions.
- Browser storage can be cleared. Download project files for a durable backup.