Plugins + Scripts [Experimental] AlternativeHairPhysics

• I tore out the Impostor render mode. It's Compute-only now as that seems to be the better long-term bet
• Tweaks to the k-buffer that should result in significantly better performance at K=4 (default)
• Immediately ate into the perf improvement with some occlusion fixes, but should still be a net win
• Added sliders for tip curl, which is meant to break up the unnatural smoothness of the hair

I managed to increase the size of the k-buffer - allowing for better anti-aliasing. I also added an Analytic Coverage toggle, which makes the AA cheaper.

The end result is better-looking hair for more or less the same performance

Before

After

I've built a new render mode - Compute. Impostor rendered hairs on a bunch of transparent 'cards', which VAM rasterized pixel by pixel even though they were mostly transparent. Compute instead has one card, which is rasterized manually.

The end result is a huge improvement in FPS - better than stock VAM hair even at max settings (at least for me). The downside is bugs. Lots of bugs.