|To produce a closed shell, Sewing allows to specify the value of working tolerance exceeding the size of small faces belonging to the shape.|
|However, if we produce an open shell it is possible to get incorrect sewing results for a large value of working tolerance (if the value of working tolerance exceeds the size of faces lying on an open boundary). |
The following recomendations can be proposed to the users for tuning-up the sewing process:
- Use as small working tolerance as possible. This will reduce the sewing time and, consequently, the number of incorrectly sewed edges for shells with free boundaries.
- Use as large minimal tolerance as possible. This will reduce the number of small geometry in the shape, both original and appearing after cutting.
- When a shell with holes (free boundaries) is expected as a result of sewing then the working tolerance should be set to a value not greater than the size of the smallest element (edge) or smallest distance between elements of such free boundary. Otherwise the free boundary may be sewed only partially.
- It should also be mentioned that the Sewing algorithm is unable to understand which small (less than working tolerance) free boundary should be kept and which should be sewed.