VEX Fluffy Cloud shader

This shader is used by the i3dgen program (or the 3D Texture output driver) to generate a 3D texture map.

This shader will simply computes a density field representing a noisy sphere.

Parameters

Noise Frequency	how quickly the noise changes over space
Noise Offset	translation of the noise
Cloud Time	noise is computed using 4D noise. The cloud time provides the offset for the 4th dimension. This allows the noise to change smoothly over time.
Noise Amplitude	strength of the noise
Noise Roughness	fractal lacunarity
Turbulence	number of octaves of noise are computed
Cloud Radius	the size of the sphere.
Fringing	The resulting density is determined by whether the sample point is inside or outside the noisy sphere. The fringing controls the softness of the edge of the noisy sphere.

Example name	Example for