I've been playing around with the math for custom projection matrices in Godot. I found something I'm pretty happy with! The three dots define the mid-planes of the projection matrix. This is required for efficient rendering of flat portals, especially if one is to avoid near-clipping errors

Testing a little idea I had for how to render a portal in Godot -- it works!

silly little trippy render

I made a little animated version of the cover art for somnigraph, for use in youtube shenanigans

test render from an abandoned animation project