Skill

react-three-fiber

Name: react-three-fiber
Author: Vercel Labs

render 3D scenes from JSON specs

Published by Vercel Labs Updated Jul 17

Covers React 3D UI Components

Description

React Three Fiber 3D renderer for json-render. Use when working with @json-render/react-three-fiber, building 3D scenes from JSON specs, rendering meshes/lights/models/environments, or integrating Three.js with json-render catalogs.

SKILL.md

@json-render/react-three-fiber

React Three Fiber renderer for json-render. 19 built-in 3D components.

Two Entry Points

Entry Point	Exports	Use For
`@json-render/react-three-fiber/catalog`	`threeComponentDefinitions`	Catalog schemas (no R3F dependency, safe for server)
`@json-render/react-three-fiber`	`threeComponents`, `ThreeRenderer`, `ThreeCanvas`, schemas	R3F implementations and renderer

Usage Pattern

Pick the 3D components you need from the standard definitions:

import { defineCatalog } from "@json-render/core";
import { schema } from "@json-render/react/schema";
import { threeComponentDefinitions } from "@json-render/react-three-fiber/catalog";
import { defineRegistry } from "@json-render/react";
import { threeComponents, ThreeCanvas } from "@json-render/react-three-fiber";

// Catalog: pick definitions
const catalog = defineCatalog(schema, {
  components: {
    Box: threeComponentDefinitions.Box,
    Sphere: threeComponentDefinitions.Sphere,
    AmbientLight: threeComponentDefinitions.AmbientLight,
    DirectionalLight: threeComponentDefinitions.DirectionalLight,
    OrbitControls: threeComponentDefinitions.OrbitControls,
  },
  actions: {},
});

// Registry: pick matching implementations
const { registry } = defineRegistry(catalog, {
  components: {
    Box: threeComponents.Box,
    Sphere: threeComponents.Sphere,
    AmbientLight: threeComponents.AmbientLight,
    DirectionalLight: threeComponents.DirectionalLight,
    OrbitControls: threeComponents.OrbitControls,
  },
});

Rendering

ThreeCanvas (convenience wrapper)

<ThreeCanvas
  spec={spec}
  registry={registry}
  shadows
  camera={{ position: [5, 5, 5], fov: 50 }}
  style={{ width: "100%", height: "100vh" }}
/>

Manual Canvas setup

import { Canvas } from "@react-three/fiber";
import { ThreeRenderer } from "@json-render/react-three-fiber";

<Canvas shadows>
  <ThreeRenderer spec={spec} registry={registry}>
    {/* Additional R3F elements */}
  </ThreeRenderer>
</Canvas>

Available Components (19)

Primitives (7)

Box -- width, height, depth, material
Sphere -- radius, widthSegments, heightSegments, material
Cylinder -- radiusTop, radiusBottom, height, material
Cone -- radius, height, material
Torus -- radius, tube, material
Plane -- width, height, material
Capsule -- radius, length, material

All primitives share: position, rotation, scale, castShadow, receiveShadow, material.

Lights (4)

AmbientLight -- color, intensity
DirectionalLight -- position, color, intensity, castShadow
PointLight -- position, color, intensity, distance, decay
SpotLight -- position, color, intensity, angle, penumbra

Other (8)

Group -- container with position/rotation/scale, supports children
Model -- GLTF/GLB loader via url prop
Environment -- HDRI environment map (preset, background, blur, intensity)
Fog -- linear fog (color, near, far)
GridHelper -- reference grid (size, divisions, color)
Text3D -- SDF text (text, fontSize, color, anchorX, anchorY)
PerspectiveCamera -- camera (position, fov, near, far, makeDefault)
OrbitControls -- orbit controls (enableDamping, enableZoom, autoRotate)

Shared Schemas

Reusable Zod schemas for custom 3D catalog definitions:

import { vector3Schema, materialSchema, transformProps, shadowProps } from "@json-render/react-three-fiber";
import { z } from "zod";

// Custom 3D component
const myComponentDef = {
  props: z.object({
    ...transformProps,
    ...shadowProps,
    material: materialSchema.nullable(),
    myCustomProp: z.string(),
  }),
  description: "My custom 3D component",
};

Material Schema

materialSchema = z.object({
  color: z.string().nullable(),         // default "#ffffff"
  metalness: z.number().nullable(),     // default 0
  roughness: z.number().nullable(),     // default 1
  emissive: z.string().nullable(),      // default "#000000"
  emissiveIntensity: z.number().nullable(), // default 1
  opacity: z.number().nullable(),       // default 1
  transparent: z.boolean().nullable(),  // default false
  wireframe: z.boolean().nullable(),    // default false
});

Spec Format

3D specs use the standard json-render flat element format:

{
  "root": "scene",
  "elements": {
    "scene": {
      "type": "Group",
      "props": { "position": [0, 0, 0] },
      "children": ["light", "box"]
    },
    "light": {
      "type": "AmbientLight",
      "props": { "intensity": 0.5 },
      "children": []
    },
    "box": {
      "type": "Box",
      "props": {
        "position": [0, 0.5, 0],
        "material": { "color": "#4488ff", "metalness": 0.3, "roughness": 0.7 }
      },
      "children": []
    }
  }
}

Dependencies

Peer dependencies required:

@react-three/fiber >= 8.0.0
@react-three/drei >= 9.0.0
three >= 0.160.0
react ^19.0.0
zod ^4.0.0

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