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Generating outline of a polyface mesh

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I would like to ask your help regarding the following issue.

My colleagues exported from Revit a surface-like object, which appear in Autocad 3D as Polyface Mesh. Is there any way to get the outer edge of this kind of object (in 3d)?

I tried to hatch it, and generate its boundary, but the problem is that the 'inner edges' won't disappear. In addition, the hatch gets flattened during this procedure.

I attached an example.

Thanks for your help!


new block.dwg

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