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Hello there I was looking for a solution on how to simulate two smoke objects with different density fields and still have them interact. I couldn't find a solution from a quick search so I thought I'd post here now it's resolved. To achieve this result you need to dive inside each smoke object and disconnect the velocity field. Copy the velocity field creation dop from within an object and attach it with an apply data beneath the merge where you bring the objects together. Set the data sharing parameter on this node to "Share Data In One Timestep" and you should be good to go. You could also share more fields between smoke objects if you don't require individual data for both I've attached a hip file All the best, Lucy multiObjectInteraction.hipnc