Emit smoke when moving only

Hi,
We have a scene where bulldozer takes down the shed. We want only dust where wood moves and stationary wood needs to have no smoke (otherwise all wood planks start making smoke ). We tried this maya tutorial but it doesn’t work. Do you know how? we use max Thanks Phoenix for Maya
Also maya has scale 3ds max doesnt. maya has position and value 3ds max confusing x and y

I think I got it. I didn’t add speed channel in the output

I’m glad you sorted it out. You can find a bit more about the Discharge modifiers in Max here - Phoenix for 3ds Max

Cheers!