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How to stop emission of smoke?


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Sorry, kind of new to Houdini here & surprised I can't figure this out: How do you stop smoke from being emitted within a dopnet? 

I have a scene where the smoke from an object ( a cube wired into an object merge wired into a fluid source node that creates smoke density) and then I use a suction target to make the smoke form into text when it rises. The thing is I only want the source to be emitting smoke for about 24 frames, and then I just want to watch the emitted smoke form into words. Does anyone know how I can do this?


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