Issue with projection over seam of sphere face

1

Hello, I am having an issue with the projection tool in geom, i am trying to project a wire (with 1 edge inside of it) to a spherical face using Operations/transform/projection.

the issue, the projection ‘goes over’ the seam of the face, and therefore the projected wire has an extra vertex (in the middle). I tried to remove this vertex by removing it using repair/fuse collinear edges within a wire but the resulting object still has the vertex.

neither of this operations have a tolerance or any parameters i can use to be able to get the desired result. any ideas/recommendations? @cbourcier I think this is kind of related with previous issues we discussed here: Issue with projection of edges with seam to create section of a face - #11 by franco.ota

here one can find the screenshot for better understanding,
white, the wire i am projecting,
red, the obtained projection with show vertex ON
grey, the spherical face

image
image904×661 23 KB

and here one can recover a tar file with the two brep geometries, the wire and the face to test.

example.tar.gz (16,4 KB)

I could do it manually by rotating the sphere or something in that like, but it may break my workflow. I also notice that if I run repair/shape processing on the projected one, this is ‘solved’ but this would be more of a patch solution instead of solving the root of it?

regards,

2

so, I did more testing:

  • limit tolerance on two original objects, the result is exactly the same
  • use repair/shape processing (all true except toBeizer) on face before projection, the result is exactly the same

I am ending up with two edges that when creating the wire, i can not fuse the co-linear middle vertex.

another test that might help to debug this maybe?:

  • if I create a face using this edge and other created edges on the same face, then I select the face, create a shell, and use remove extra edges with Union faces ON this will remove the extra vertexes, as desired. the issue with this is that for this workflow, one needs to create other edges that does not have necessarily and do several entities as middle steps

hope this findings helps to troubleshoot this problem