The two colors that are blended together to form the cloud.
The contrast between Color1 and Color2. For example, if the Contrast value is -1, Color1 and Color2 are reversed. The slider range is 0 (the two colors are averaged over the entire texture) to 1. The default value is 0.5.
The Edge Rolloff Parameters determine how the texture’s transparency changes as the surface it is mapped to turns away from the camera.
Determines how diffuse or concentrated the edge rolloff is. If the Center_thresh value is low and the Edge_thresh value is high, the texture resembles a dense cotton-ball. If the Center_thresh value is high and the Edge_thresh value is low, the texture resembles a wispy cloud. The slider range is -1 to 0 for Center_thresh and 1 to 2 for Edge_thresh. The default value is 0 for Center_thresh and 1 for Edge_thresh.