Quote from: reck on November 21, 2008, 10:54:46 AM
I've got an image that you can see below where I would like to mask out all the clouds below the red line, I only want to see the clouds above the red line.
If you still want to mask away clouds below the red line, here's a really simple method that just works:
Create a distance shader and use it as a blend shader for your cloud fractal, set the near color to white, the far color to black, and adjust the distance value so that it fits your scene. Near distance would be 0 and far distance - well you'll have to try but start with ..10k
If you still want to mask away clouds with the painted shader, why not set your camera to an ortographic view and paint onto the ground of the planet (paint where you want the clouds to appear), THEN use it as a blendshader for the cloud fractal. Shoud work, too, but is more complicated than the other solution with the distance shader. Also renders slower.
Frank