Our first step is creating an atmospheric gizmo containing volume effect, and to create a VRayPhysicalCamera, a VRaySun+Sky system and set LWF (Linear Work Flow), in a metric scale scene. The last step makes it easier to handle large scenes.
Then Create the gizmo with Create> Helpers> Atmospherics > Box Gizmo and setting volume for a cloud layer: 6000x6000x300 meters. Next step: VRayPhysicalCamera.
All default params used, eccept reducted focal lenght, to achieve a grandangular emphasizing sky effect. Put in scene as shown to increase perspective look.
Creating light system is quite easy. go to Create > Lights > VRay > VRaySun, dropping light in scene. check yes to popup question to get automatically VRaySky map in 3dsmax Environment.
Use default VRaySun params. Take a look at VRaySky map included in Environment map slot, and further selection in VEF.
Now in 3ds max "Environment and effects" module (press "8") we add VEF effect. Following default params:
1st rollout, General parameters, manages main effect params.
2nd modulates some features with maps. We're getting clouds adding map to density slot.
3rd rollout links VEF to the related gizmo, that can be shaded by user-defined lights. Step one: link VEF to gizmo.
Click Add to select gizmo from scene..
Resulting render. not our best!
We see gizmo is "full" of dark and dense fog, so light cannot penetrate it.
Adding texture to density channel we can modulate density areas. Use Noise map with following params:
Noise params used for clouds
Following final render parameters:
Params for VEF appearance and quality. Thanks to three slots, we meet great flexibility.
More than the other parameters, step size affects render times. Increasing this value decreases render times, trading off render quality.
The final render:
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