locking Dirt texture to one object

[coilbook]

Hi Can we have dirt texture locked to one object so when the object touches the ground you wont see more dirt appear since dirt detect another surface Thanks

on the picture you can see front wheel only have dirt on the protector and not on the side of the wheel since they do not touch the ground but on rear wheels dirt is now on the sides too since they touch the ground. Would be nice to have a check box DIRT PER OBJECT where it work on sub levels only and not if other objects touch it.
We use 3ds max

[kavorka]

Yes, this would be awesome!
So many times I just want the dirt localized to the object itself.