Vray Fog with moving Camera

V-Ray V-Ray for 3ds Max General
1

I think this is not a bug but i don’t know how to prevent this:

When a camera moves through a gizmo with density mapped fog (clouds) the smaller clouds suddenly fade in if you get near them.

It looks like the “level of detail” feature in game-engines.

The noise and the box-gizmo are not animated, only the Physical-Camera.

Does anyone know how to stop this?

Here is a very early rendered preview of the scene that i am working on
where you can see it happen at the beginning:

www.vector-film.de/TruftZ.wmv

2

I think you need to increase the Max. steps parameter for the fog, so that it traces further into the volume.

Best regards,
Vlado

3

Thanks!

That fixed the fading effect:
www.vector-film.de/TruftZ_C.wmv

I have also lowered the stepsize.
I think it caused this noise-like effect when moving towards the clouds:
www.vector-film.de/TruftZ_B.wmv