title: Output encoding in Aframe
body: <p>This question is related to <a href="https://stackoverflow.com/questions/65812649/aframe-android-metallnesmap-and-roughnessmap-issue">AFRAME: Android metallnesMap and roughnessMap issue</a></p>
  <p>Main idea: I want to see the same metal texture on iOS and Android devices in my aframe project. In the <a href="https://gltf-viewer.donmccurdy.com/" rel="nofollow noreferrer">viewer</a> it is realy the same, but there only three.js</p>
  <p>Can I change somehow WebGLRenderer.outputEncoding in Aframe?
  The propertie is undefined for a scene - this.el.sceneEl.renderer.outputEncoding.</p>