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i want to create some ground fog that fades with heigth.

is there any possibility to create an edge fall-off on a constant volumetric object?
i tried with mapping the trans slot of the material assigned to the volumetric (gradient textture) but only got weird results or crashes with fire.

any help appreciated!

Hey, just a quick idea.
Maybe that will work:

as i read/observed the constant and noise volumetrics will always create a bounding box around the object, and not really "fill" the object itself. It would be pretty cool though if that was possible..
I guess it is possible with variation in particle density, but that is a rather elaborate workaround.