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Mass Properties not available


New member
Hello all,

I imported a shape that I downloaded into solidworks. It was originally a .skp file that I converted into a .dxf using a googlesketchup plugin. When I imported into solidworks and tried to view the mass properties, they weren't available, even when I set my material. The thing is, I know what the weight of the item is without the need for SW to find it for me, I just want it to be included in an overall assembly to make it easier on myself. So, my question is either a) any thoughts as to why I can't view the mass properties for the object and/or b) can I manually set the mass of the object so it appears in an overall assembly.