Animation & frosted glass

[AlexP]

We're due to start working on an animation of some office building, there is a LOT of frosted glass.
What methods are there to do frosted glass for animation without it taking a million years?

Wondering about rendering it with 1.0 glossiness and then blurring in post, has anyone done this before successfully?

Any ideas appreciated

[Morbid Angel]

Yeah you can do it in post, but you would need to split the frosted glass on a separate layer. Use its alpha or a multimatte and just blur the image below it. Its really the only way, besides doing some physical stuff like volume scattering but I doubt it would be fast, maybe worth a try tho.

[AlexP]

Ok, in theory that should be quite doable.
I guess should be able to render the mask needed at the same time

[Macker]

Frosted glass looks so cool when rendered though...

[AlexP]

Does indeed... just takes too damn long