API & MCP

Everything a person can do on Procedural Material Graph (PBR), a program or AI agent can do with the same inputs and get the identical result.

HTTP API

POST https://renderloommaterialgraph.usefulweb.app/api/v1/calculate – run Procedural Material Graph (PBR)
GET https://renderloommaterialgraph.usefulweb.app/api/v1/tool – inputs, output schema, examples
OpenAPI 3.1: /openapi.json · /openapi.yaml
Errors: application/problem+json; 422 includes per-field errors.

Procedural Material Graph (PBR)

Run a Renderloom Material Nodes graph — noise, Voronoi, bricks, gradients, blends, domain warp, levels, curves and surface-from-height nodes — and get base color, normal, roughness, metallic, ambient occlusion and height maps, a lit sphere and a tiled plane preview, a per-node report and the editable graph. Start from brick, wood, stone, metal or fabric.

Inputs of Procedural Material Graph (PBR)
Field	Type	Default	Description
`preset`	select (brick, wood, stone, metal, fabric, custom)	"brick"	Material graph
`graph`	textarea	—	Graph JSON (for a custom graph). Format renderloom-material-graph version 1 (schema at /static/apps/renderloom/material-graph.schema.json). Copy it from Renderloom → Material Nodes.
`size`	integer	256	Map size (px)
`seed`	integer	-1	Graph seed (−1 keeps the graph’s seed)

Example request

Red brick wall

curl -X POST https://renderloommaterialgraph.usefulweb.app/api/v1/calculate -H 'content-type: application/json' -d '{"preset":"brick"}'

Every result contains

inputs (normalised, defaults applied), summary, result (validated against the published schema), units, assumptions, sources, warnings, computedAt and links.

MCP (Model Context Protocol)

Streamable HTTP endpoint: https://renderloommaterialgraph.usefulweb.app/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
Tools: renderloom_material_graph
Local stdio connector: node src/mcp-stdio.ts --tool=renderloom-material-graph

{
  "mcpServers": {
    "renderloom-material-graph": { "type": "http", "url": "https://renderloommaterialgraph.usefulweb.app/mcp" }
  }
}