How to color the inner walls of an object?

Question

three.js

We create any object, place a light source above it and everything is as expected.
We place the light and cameras inside this object and find out that by default the inside of the shape
is not filled. How to make it fill up?

Answer 1

The material applied to this object has a "side" property.
You need to assign THREE.BackSide or THREE.DoubleSide to it.
here read