Hypertexture

The cost is high for this function, as it uses noise() many times to calculate the hypertexture.

In 1989, Perlin and Hoffert presented hypertexture, a modeling technique where an ordinary surface is thickened into a region of space with some density.

The volume density functions that I use for gases are, in reality, hypertexture functions.

Then, for each type of hypertexture, I construct a different "application" code, describing a particular hypertexture.