3D entities and arbitrary extrusion direction for planar entities

[wuzejinCN]

1, Some arc's position is not correct.
2, Some rectangle was changed to tow triangles.
The testing file is attached.


TestEntities.zip

[vagran]

Thanks for the nice test sample!

From the first look, it seems there are a lot of entities, which are arbitrary oriented in 3D space. The problematic arc probably has some arbitrary extrusion direction, which now is not fully supported because of 2D-only implementation. I will think about supporting an arbitrary projection plane. It is also an old problem with 3DFACE triangulation, I cannot get proper order of the vertices - an approach, which work on one file, breaks another file. I will revisit it once again.

Also checked in QCAD which has similar problems:

[wuzejinCN]

Indeed, due to the conversion from three dimensions to two dimensions for display, it would be better if this could be resolved. Thanks!