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hi, I am studying inverse matrix VOP with packed objects. When I apply the VOP with one packed object, everything is fine. However, when doing with two packed objects, I get unexpecting deformed result. I guess a key is "set attribute" VOP setting. Especially I am not sure how to use "point or primitive parameter". For instance, I use one packed primitive object and pick prim number 0. The result is correct. Next, I merge one more object and still keep selecting prim0 object to extract matrix. However, I got strange result. I am expecting pig should keep a default shape, and rubber could be deformed so much because of using prim 0's matrix. My guess is that I properly need to understand how to use setAttribute > pointOrPrimitive parameter. Default value is -1, so I set to 0 in order to focus on outputting correctly for only pig. However, it does not work well. Thus, I appreciate if anyone tells me what wrong with my attached file, thank you so much. invertMatrixTest01.hip