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Hi ! i'm trying to get a better understanding regarding DOP data in houdini ! i can not find any detailed info the only way for me is just digging it myself. Starting from a simple experiment. lets say i have an RBD object and try to attach some data to it. as far as i know the solver looks for the specific data and change object's state according to that data. for example RBD solver looks for the Forces subdata and change objects position. if i create gravity force - Forces/Gravity subdata is created on specific objject and this object falls down to the ground. It works even if i rename Forces/Gravity to something Like Forces/Blablabla Well! Assuming this, instead of creating gravity force, i create an empty data named like Forces/Down and set "force" option to [0,-1000,0] with "modify data" operator. then with "apply data" operator i attach this data to object. (It's seen in Geometry spreadsheet tab) But when i press play button - nothing happens. Where did i make mistake ? or someone could point me to somewhere where i could find an extra info about DOP's inner matters? Houdini help is not much clear from this point of view Just in case i attach hip file. here Thanks in advance ! mydata.hip