Hi, I am trying to cache out a rather large sim file So I can skin and do whitewater later. However the files are very large mainly due to the collision geometry created in the static solver static objects that the sim needs to interact with. I want to just save out just the FLIP, but when I ad a 'delete' node and remove the objects, even after the 'output' the sim acts as if they are not there and fall through the bottom. How can I just cache the sim for later skinning and whitewater calculations?

Personally I would strongly suggest saving your geo outside of the DOP network. Also, even if there's an "output" node present, your DOP network will be evaluated all the way down to the node with the orange output flag, which is probably the cause of your collision disappearing.