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Answers
Bridge curves will pickup the mid point of an existing curve. 3D curve (3d fit spline) will not:
So, one of the reason's I liked Ilya's 3D spline feature script, with my modification, I could pick the mid point of another curve. This is something I do a lot when creating planar faces on mesh data. But, can I stay in native code without feature scripts?
planar face on mesh:
1. construct 2 vectors
2. sweep one vector along the other
3. extend surface edges beyond working area
4. sketch your stuff
5. offset 0mm to create a trimmed surface
I used a modified feature script but you can use a bridge curve and create 2 vectors:
Sweep to create a plane:
Extend surface to make plane usable, this is a feature script:
Use this plane to create a sketch:
Create another sculpted surface (trimmed surface) from sketch:
I went from mesh data to a planar face which is the start of a part. Notice the 2 vectors (highlighted curves) are co-planar to my sculpted face. This is repeated several times to stitch together the beginning of a part.
This is an example of surfaces migrating into solids.
You can use this feature to extrude a line in a direction defined by two vertices, rather than having to create another line to sweep along:
https://cad.onshape.com/documents/24819ddab7dc83c810eb8246
IR for AS/NZS 1100