I'm trying to make flat planes that face the camera (billboards) using geometry nodes.
It's pretty easy to do with particles, you just add a track to contraint pointing at the camera.
I started with this thread: via Geometry Nodes' points tracked to camera
But it rotates them all, hard to see without changing the texture:
Here is my attempt at using it for billboards:
Trees do not stand up straight, and rotate around when you move the camera. I've tried playing with different settings, but nothing looks right.
Ideally they would always be straight up and down relative to the camera.
Another nice option would be if they were always straight up and down globally, so the top always was going up the Z axis, but the first one would be preferred.
I would also prefer to use current blender nodes and not the 3.0 ones, since they would be more backwards compatible (but b3 would be interesting too)
Here is my file: