[material] Add metalnessMap and roughnessMap. (#2722)
[material] Add metalnessMap and roughnessMap. (#2722)


RSpace/aframe,RSpace/aframe,mkungla/aframe,aframevr/aframe,wizgrav/aframe,chenzlabs/aframe,ngokevin/aframe,chenzlabs/aframe,dmarcos/aframe,dmarcos/aframe,wizgrav/aframe,mkungla/aframe,ngokevin/aframe,aframevr/aframe