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Hi, I am trying to implement in an Optistruct optimisation a model that will help me to define a specific objective function I need for my work. This model needs some plies geometrical information (for example, area and perimeter of each ply generated) as input in order to evaluate manufacturing cost related to the laminates at each iteration of the free-size optimisation. I think I have two ways to do that: 1) to make Optistruct printing the .fem output file at each iteration and create an external script able to extract the geometrical parameters I need from the .fem file in order to calculate the external response (I will need DRESP3). The creation of this external script, extracting area and perimeter of the plies, does not seem to be so trivial. 2) to obtain the geometrical info inside Optistruct and create the response I need using DRESP2 along with equations internally created by myself. I definitely prefer the choice 2) but the issue is that I do not have any idea on how to get these geometrical info as responses in Optistruct. I would greatly appreciate any help to solve this issue or any suggestion on the script creation to solve the problem following the choice 1). Thank you in advance for any support. Alessandro