For the past few days i was finding a way to blend two geometries which is something similar to the metalball kind of behavior.Then i looked into the "levelset in production" presented by the guys from Sony imageworks which provided the exact info wat i was searching for...
since Houdini has the capability of generating SDF(Sign Distance Function) ,i tried to isooffset the geometries and used volume mix operator along with the math provided by the Sony guys....
still need to find a solution for the mesh jittering
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