Properly alpha masked skies

Oso3D

One problem I've often encountered with trying to play with sky domes is that where the sky is most transparent has little to do with brightness or color.

For example, you want most clouds to be opaque, but the apparently darker blue spaces to be more transparent but not the darker shadow of the clouds... ugh.

I've sometimes had very limited success trying to select 'blue'.

 

 

nonesuch00

timmins.william said:

One problem I've often encountered with trying to play with sky domes is that where the sky is most transparent has little to do with brightness or color.

For example, you want most clouds to be opaque, but the apparently darker blue spaces to be more transparent but not the darker shadow of the clouds... ugh.

I've sometimes had very limited success trying to select 'blue'.

 

 

I'm not sure how they model clouds but (just babbling a guess - lol, don't take what I say as scientific fact) the greyer the part of the cloud the thicker the cloud cover at that point so what is reflected is poorly lit water droplets and the whiter the cloud the thinner the cloud cover so what is reflected is other water droplets both like a very confusing hall of mirrors.

Oso3D

Only sometimes, because if a cloud is to the side of the sun (rather than mostly in line with it) you will have bright white where the cloud is lit and dark(er) gray where the cloud is shading itself. The blue sky gaps will appear to be somewhere between the two extremes.

So you can't filter simply by brightness.