TLDR: I kind of got things working but it feels broken. It would be nice if there was some guidance on this. I cannot find the help section on this just an old post.
Custom Lighting has me a little confused. And also the “Use current scene lights” doesn’t seem to do anything.
The axis’ feels both backwards and switched around. It’s hard to tell where the reference is. Two of the values feel backwards and two of the values seem like they’ve been swapped. I did get what I was looking for (kind of).
I’m more or less trying to create this lighting from all four directions. And have a display mode for each of them. Simple as this:
I’ve sort of got what I was after but I’d like to have a little more insight into what I’m actually doing.
I also had to do a bit of trickery to get an RCP to work. The lighting seemed to prefer a saved view or else it came in all dark. It looks more or less like I wanted but I have a feeling I’ll be adjusting the angles a lot in future projects.
To summarize this post: I can’t find the official help documentation on Display Mode Custom Lighting, and the “Use current scene lights” button seems like it’s dead/disconnected.