One thing to remember about real clouds vs CGI is Dynamic Range, current display technology and that goes for LCD and Plasma not just CRT dose not have the dynamic range to reproduce the kind of bright lighting needed for realistic cloud lighting: this may happen with some future display technology what that is called and when it will be available I have no idea but for now it is not possible.
For example the sun in Terragen if it where the real thing would produce vary intense glare that would be next to impossible to look at if the camera in TG2 where facing it as the intensity of the light would be overwhelming; if you look at clouds near the sun you will see that the side closest to the sun is brighter that then opposite side (Light falls off proportionately to distance) also under these conditions the side closest to the sun will have the so called "Silver Lining" effect where the sun illuminates the clouds edge.
Cloud edges form my own binocular and telescope observations are not as sharply defined as one may think, indeed I find the cloud edges in TG2 to be too sharp for most instances.
Over all then good work here, just drooping in my two cents worth on matters that have not yet come up in this discussion.
Regards to you.
Cyber-Angel
