Create a New Decentraland SDK7 Scene

When the user wants to create a new scene, follow these steps:

1. Ask What They Want to Build

If the user hasn't described their scene, ask them:

• What kind of scene? (gallery, game, social space, interactive art, etc.)
• How many parcels? (default: 1 parcel = 16x16m)
• Any specific features? (3D models, interactivity, UI, multiplayer)

2. Scaffold the Project with /init

Always run /init first. This uses the official @dcl/sdk-commands init to create scene.json, package.json, tsconfig.json, and src/index.ts with the correct, up-to-date configuration, and installs dependencies automatically.

Never manually create scene.json, package.json, or tsconfig.json — the SDK templates may change between versions and hand-written copies will diverge.

3. Find Matching 3D Assets

Before writing scene code, check both asset catalogs for free models that match the user's theme:

1. Read {baseDir}/../../context/asset-packs-catalog.md (2,700+ Creator Hub models — furniture, structures, decorations, nature, etc.)
2. Read {baseDir}/../../context/open-source-3d-assets.md (991 CC0 models — cyberpunk, medieval, nature, sci-fi, etc.)
3. Read {baseDir}/../../context/audio-catalog.md (50 free sounds — music, ambient, SFX, game mechanics, etc.)
4. Suggest matching models and sounds to the user
5. Download selected models into the scene's models/ directory:

   mkdir -p models
   curl -o models/arcade_machine.glb "https://builder-items.decentraland.org/contents/bafybei..."
   

Important: GltfContainer only works with local files. Never use external URLs for the model src field.

4. Customize the Generated Files

After /init completes, customize the generated files based on what the user wants:

scene.json

Update the display fields and parcels:

• display.title — set to the scene name
• display.description — set to a short description
• scene.parcels — for multi-parcel scenes, list all parcels (e.g., ["0,0", "0,1", "1,0", "1,1"] for 2x2)
• scene.base — set to the southwest corner parcel

src/index.ts

Replace the generated code with the user's scene. Example:

import { engine, Transform, MeshRenderer, Material } from '@dcl/sdk/ecs'
import { Vector3, Color4 } from '@dcl/sdk/math'

export function main() {
  // Create a cube at the center of the scene
  const cube = engine.addEntity()
  Transform.create(cube, {
    position: Vector3.create(8, 1, 8)
  })
  MeshRenderer.setBox(cube)
  Material.setPbrMaterial(cube, {
    albedoColor: Color4.create(0.2, 0.5, 1, 1)
  })
}

5. Post-Creation Steps

After customizing the files:

1. Use the preview tool to start the preview server (or run npx @dcl/sdk-commands start --bevy-web manually)
2. The scene will open in a browser at http://localhost:8000

Important Notes

• Always place objects within the scene boundaries (0 to 16parcelsX for X, 0 to 16parcelsZ for Z)
• Center of a single-parcel scene is (8, 0, 8) at ground level
• Y axis is up, minimum Y=0 (ground)
• The main field in scene.json MUST be "bin/index.js" — this is the compiled output path
• The jsx and jsxImportSource tsconfig settings are already included by /init — do not modify them