Hi, I'm still pretty green to houdini and I have a question I hope someone could help me with. I've made a smoke sim and it works at the origin point, but when I parent it to tracking data it doesn't show up. The hierarchy looks like this: Tracking data > objects > Source object > DOP network. The source object and the rest of the object track and move perfectly, but the sim just will start or I just can't see it. Sims don't just have to be at the origin do they?