missing/add material.alphaMap to standard material.js

[Olm-e]

Description:

THREE.js seems to support alphaMap transparency texture out of the box, https://threejs.org/docs/index.html#api/materials/MeshStandardMaterial

so it would be very handy to have it supported in the standard material in A-Frame as well for plenty of things ...

• A-Frame Version: 7.0 Master
• Platform / Device: all

https://github.com/aframevr/aframe/blob/v0.7.0/src/shaders/standard.js

[samyH]

Is there no way to apply alpha maps to .glb or .obj models?