Adding texture to RectAreaLight?

Is it possible? How?
So that the reflection of the light yields the texture?

Do you mean something like that (it’s a duplicate of currently open PR) ?

Something like that and

this: three.js/webgl_lights_spotlight.html at c32416a26d3fa00104b4205284f5c943197feebf · mbredif/three.js · GitHub

I can’t get this working.

It’s just a proposal so far - it’s not part of the library. You could try manually copying the necessary parts from the PR - otherwise you’d need to wait for it to be merged I think.