Procedural Menger Sponges

First attempt at making a fully procedural Menger Sponge in Blender. It seems too fuzzy, since the volumetric step size is too large.

Reduced the step size! Much sharper.

Colored.

Programmed as a raymarcher in Processing: https://www.khanacademy.org/computer-programming/menger-sponge-raymarcher/6190306871361536