Make faces transparent

Questions
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1

Hey, i use BoxGeometry and want to make some faces transparent. Most of the stuff I found on the www was old and deprecated. Using geometry.faces[2].color = new THREE.Color(0xFF0FF00) did not work. I saw BoxBufferGeometry has a materialIndex property to change material. But can this be done with BoxGeometry? Would be nice if someone could light me here. I also dont find a lot about how to work with multiple materials with newer versions

Thanks in advance

2

Try it like so: https://jsfiddle.net/fps8ox4h/

BoxBufferGeometry supports a material for each side of the box. This allows you to modify the transparency settings for each side.

3

Thanks for your reply, but I actually wanted to know how to do multiple materials with BoxGeometry not BoxBufferGeometry.
Because I need to change vertices of the geometry and I only know how to change them with BoxGeometry like so:

this.geometry3D.vertices[7].x = IIP.x
this.geometry3D.vertices[7].y = 0
this.geometry3D.vertices[7].z = IIP.z

Changing vertices with BufferGeometry is not as expected. See https://jsfiddle.net/nwxjzy5g/1/. The face is loosing connection to the other faces and it openes a hole? How would I change vertices of a BoxBufferGeometry with same behavior as BoxGeometry. This is what I want https://jsfiddle.net/82ayrcuk/ when changing vertices

When I just created these fiddles Im noticing that multiple materials work same on BoxGeometry. This may be the solution https://jsfiddle.net/82ayrcuk/