Probably Fusion 360 and FC uses a different "modelling engine" and probably Fusion 360 is doing some "healing" on the model prior to apply the thickness tool or do some cheat ignoring some rules that break the model, as the list that are in the OCC documentation.rahmanshaber wrote: ↑Wed Aug 31, 2022 1:33 pm @mfro I made the same part in the Fusion 360 and it able to create shell with the part. I know both have different ways to do it.
We are speaking of continuity of surfaces, C0 and C1 and similar terms.
See maybe:
https://dev.opencascade.org/doc/occt-7. ... _data.html
under Continuity of Curves and Surfaces
or for short:
C0 (GeomAbs_C0) - parametric continuity. It is the same as G0 (geometric continuity), so the last one is not represented by separate variable.
G1 (GeomAbs_G1) - tangent vectors on left and on right are parallel.
C1 (GeomAbs_C1) - indicates the continuity of the first derivative.
G2 (GeomAbs_G2) - in addition to G1 continuity, the centers of curvature on left and on right are the same.
C2 (GeomAbs_C2) - continuity of all derivatives till the second order.
C3 (GeomAbs_C3) - continuity of all derivatives till the third order.
CN (GeomAbs_CN) - continuity of all derivatives till the N-th order (infinite order of continuity).
An interesting reading could be:
https://dev.opencascade.org/doc/occt-7. ... algos.html
Your model are triggering some limitation of the "geometric kernel", the only way you have is to modify your model to comply with the "geometric kernel" requirement.
Regards
Carlo D.