256B - smooth web (gentle curves, like the first web) fills the cave

Cartoon ribbons are the exact original. The web is now generated the same way as the first web (SDF + gaussian + Taubin-30) so it has smooth gentle curves, no bumps, no flat walls - but it also fills the cave with no see-through.

• Smoothest web (sigma 3.0)
• Smooth web, a touch more web detail (sigma 2.0)