This is the example to show the custom property assignTo, although it is used in many examples it is provided here as a single concept.

NOTE: you can use dots like "mesh.material" and it will follow the objects properties as long as they exist.

<Scene>
  ...
  <cubeTexture
    assignTo="environmentTexture"
    rootUrl={'/assets/environment.env'}
  />
</Scene>

The above was used to assign the environmentTexture, which is the same as providing a value to the prop as we do in the scene below:

<Scene environmentTexture={cubeTextureInstance}>...</Scene>