This too is digital, right? Looks eerily like it was recorded in some weird setting, but really can't tell anymore.

Regardless, these are all truly spectacular :D

That's some WebGL juiciness! Really nice.

Do you post live versions anywhere?

It would be nice to see them run live :)

Scratch that.
I forgot that there would be no tex coords for the virtual vertices now. Having those would increase the number of extra data even further. So not really feasible.

I'm just loving the original trick! Would have been fantastic if it was somehow possible without the stencil buffer.

It may be possible to calculate in vertex shader and pass the data in separate uv channels. I think it'd require 5 more uv coord, 1 per virtual vertex on the camera facing tetra triangle. No backfaces
Fragment works too but is expensive

But I might be missing something. Just a thought experiment :)

Wow! That's a really cool technique. Haven't seen this one before.
It might even be possible to do it without stencils if you calculate the tetra shape analytically. 4 analytical triangle coords should be enough (never more than 4 visible to camera)

Really nice.

Will do!

Super nice!
Thought it was a signed distance field at first :)

Hooray!