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Sweep command problems


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I am having a problem with the SWEEP command. I have defined a 2d polyline profile which i want to sweep along a 3D polyline alignment.




If I use a basepoint in the middle of the profile (red circle) the function fails, if however I use another point (green square) the command works. See attached .DWG.


Bridge Model.dwg


What am i doing wrong?:?pencil.png

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Depending on the Basepoint/Alignment, the process will try to sweep a profile that backs onto itself (i.e., an illegal operation). A base point at one extreme, the green marker for instance, keeps the sweep outside of the backup.



Look at vertices 48 and 49 in the 3DPoly: Eliminating one of those makes the sweep more feasible.

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