Ah...a familiar discussion...if you weren't "supposed" to use alpha planes in Vue (according to some obscure law I don't know about), I don't think Eon would have put alpha planes in the apps. How one chooses to use them, whether as a sky or trees in the background, or figures or whatever, is up to the individual. If someone achieves the look they want in their image using an alpha plane of a sky, good for them! And as I recall, Bryce has alpha planes as well. Hmmm.

Sgiathalaich