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The solution stay in this diraction:
C:\ProgramData\Autodesk\Structural\Common Data\2013\Data\Mate
There are all catalogs, and is posible to create copy of anyone and change the name. It's important that the name started with RMAT.
In each xml file there are little manual in diferent lenguage with description how to create new material in catalog.
Regards
hi,
i have added some materials but i can not find a position in the XML where i can define the weight for the new material?
thanks Hermann