MX_background ​

Contributors ​

• Robert Long, The Matrix.org Foundation

Status ​

Draft

Dependencies ​

Written against the glTF 2.0 spec.

Overview ​

This extension allows for adding equirectangular background textures or skyboxes to glTF scenes

glTF Schema Updates ​

Usage of the extension must be listed in the extensionsUsed array:

"extensionsUsed": [
  "MX_background"
]

The MX_background extension can be added to any scene property.

"scenes": [
  {
    "extensions": {
      "MX_background": {
        "backgroundTexture": {
          "index": 0
        }
      }
    }
  }
]

The backgroundTexture property is a TextureInfo object which may include the index and texCoord properties. texCoord is optional and ignored by this extension. The referenced texture is expected to be an RGBM encoded equirectangular cubemap saved as a PNG or BasisU texture.

** NOTE: Third Room doesn't currently implement the backgroundTexture as RGBM. It ignores the alpha channel multiplier and needs to be updated to support it. **

JSON Schema ​

scene.MX_background.schema.json

Known Implementations ​

• Third Room
• Third Room Unity Exporter