Vray sun and sky system with clouds

[sewer]

Hello
I have a problem , how in vray for maya make Vray sun and sky system with clouds , how connect to Vray sun and sky system map ?
In mental ray for maya it works in this way :
http://www.youtube.com/watch?v=E1pfP...ayer_embedded#!

How make this effects in Vray for maya ?

Best regards
Sewer

[Yannick]

Can't you map your hdri with cloud in the environment as a sky override?