Combining Bodies Causes Two Bodies of Pattern on Path to Disappear

[jhackney1972]

I have a small created sphere body located on an elliptical path.  I pattern it using the Pattern on Path command without issue.  After patterning I need to Combine all the patterned bodies with the base body.  During this Combine, two of the patterned bodies disappear.  I would appreciate it if someone could tell me how to avoid this issue or register it as a flaw in the application.  My model used in the Screencast is attached.  It is at the point where the Combine should occur.

[jeff_strater]

I was waiting for @jhackney1972 to respond!  😀

This appears to be a bug.  We'll investigate.  More info if I find it.

Jeff

[jhackney1972]

Waiting on me???  A interesting twist on this issue.  If you change the pattern count to 35, the Combine works OK at least in this model on my application.

[hamid.sh.]

I think the problem is that with 34 instances those two spheres fall exactly on this edge (33 and 35 work without problem, and honestly odd numbers looks more symmetric and beautiful). I have temporarily split the knob to show the point:

Now I am not sure about the the inner workings of Fusion when combining, but it seems to me with this razor sharp edge or perhaps singularity point a edge loops is formed that during combining gets dissolved and so the surface disappears. If I add an extra edge to the sphere (e.g. by a split face) combine is successful:

[jeff_strater · Accepted solution]

I was trying to make a joke - I didn't notice at first that you had submitted the original post.  Usually you respond to every post, so I just thought "I wonder why John hasn't responded already?", then I noticed who the OP was...  My inability to make jokes illustrate why I am better suited to CAD than standup comedy.

Yes, @hamid.sh. , I suspect that you are correct about those 2 instances and that edge.  I'm a bit surprised, though, that we didn't give an error, I feel like we should have.  At any rate, it should either succeed, or fail with an error.  Partial success with dropped instances seems wrong to me.  So, it's a bug either way.

[edit] the Fusion bug for this is FUS-102947.  Thanks for reporting it.

[jhackney1972]

Thanks for looking at this for me. 

[jhackney1972]

Thanks for looking at this issue for me.  The actual required pattern count is 35, lucky for me, works well.  You insight into the issue is impressive and appreciated very much.