for some reason when i use the “use deforming” with an animation at SOP level the smoke doesn't interact anymore with my object.

in the file there are too different method, one using the SOP level animated object(which doesn't work) and another one using OBJ level animation (which works fine)

just go in the smoke DOP and use switch to see the different result

thanks for answering

When brought in this way, the solver doesn't really understand that there is anything moving, just that there is a solid obstacle that happens to be in different locations each frame. You need to activate the “Use Point Velocity For Collisions” in the solver's Relationships->Collisions tab.

thanks a lot eetu, it worked