Hello,

I have a flip simulation colliding with 2 static objects via static solver.
I want desactivate collision from a specific frame.

How can I do that ?

thanks for your help.

I'm not in front of Houdini and can't remember if the Static Object has activation parameter on it but you can try to animate the static objects at the specific frame to be outside of the FLIP sim?

It is hacky method but I used it in several production shots before (although in RealFlow instead of Houdini).

yeah efficient but not very elegant.
I wiil do that if I can't find another way

Add a Switch DOP. Wire in both your Static DOP object and a Null DOP.
Animate the switch like $SF > 30 where $SF is the current simulation from from simulation start and assuming the Null DOP is the second input.
Done.

Remember with DOPs ultimately you can do whatever you want to the data at the global substep rate. Substitute any sim data you want. Including Null DOPs and no data.

Thanks for sharing your wisdom, Jeff! I'll keep it in mind in the future if I ever need to toggle a DOP sim.