@ AP, yes please! I didn't even know there was a file sharing thread. Btw, I have been testing and learning your past .tgc files that you have posted on the cloud library thread. I was trying to combine elements of the mammatus clouds with larger shapes with no avail. Either you keep the feature scale small for detail or get large shapes. I feel like I can get the large shapes that I want but not the sharp clumpiness that I want. The vortex warp and fractal warp shaders offer lots of possibilities, although I am too much of a noob to use them effectively.
@ Dune I have not terrain in my test scene because I would want to use Terragen for skies only so I can't use the altitude offset, right? However, I can take a shape shader and merge it with the fractal and create a hole in the density, right?
Attached are my renders so far with not much manipulation for the .tgc files that I found in the cloud library.