Planes on path, or surfaces on a path, applied to a 3d spline breaking on update.

[RA_Nouveau]

Hello everyone:

I've been trying to do this on and off for about a year now and have not come up with a solution. I was hoping as my skills increased that I would come to a solution. I am hoping like with many things in Fusion there is a workaround.

The end result of this is a smooth 3d surface lofted so that it looks like an Iris leaf. I can make these flat without issue at this point. Unfortunately flower leaves also bend out in 3d and twist. Since flowers usually have more than one leaf I am trying to make a parametric component so that I can reuse the part, scale it up, etc. I could do this multiple times but it would be a real waste of potential reuse, plus it takes a few hours to make each one.

I have a 3d spline made of 2 CV splines and the intersection curve tool. This way it can be fully locked down. I have parameters to control how much it curls away from the Z axis in Y and X. It does not need to be super exact just locked down.

I tried lofting a "ribbon" flat surface with some twist to get a smooth change along the spline. Then I tried using surface disks made with patch to divide the 3d spline equally since pattern on path only works with objects. Then put a sketch on each of the leaf profile. This was attached to the ribbon to keep everything going around the plane and on the path. This works until I change the underlying spline.

I also tried as a test case (included) making 5 planes along path on the 3d spline and they all break as well once I change the underlying spline.

I would like the planes or the pattern on path disks to survive some mild updates. Which they do not. Is there a workaround for this?

I have also tried components along the path made by the spline. This way I did not have to redo all the sketches. That did not work as well.

I in the past also tried a "Ladder" structure in 2d with intersection and with in 3d with pentaprisms so that like three legged (or 4 legged) stools stacked up I could shorten one leg on each stool and then the whole thing would curl. Broke when I tried it in 3d.

I'm hoping there is indeed a workaround or something basic I am missing. Thank you all for your help.

[TrippyLighting]

In the file you attached the curve that drive the intersection sketch are simple arcs.

I can see that the planes-on-path have lost the path, however, when I reassign the patch - assuming the intersection curve is the correct path to select. - all works fine.

Updates to the parameters result in an update to the intersection curve which then drives the changes to the planes.

[RA_Nouveau]

Thank you @TrippyLighting for your response. I forgot I changed it to arcs in this version to try and see if the spline was the issue.

Is there a trick I am missing? Every time I adjust x_len or y_len (to push the top out from the centerline) the sweep on the intersection curve breaks, as do all the planes on path. I could of course go and just re-click on them every time which worked as per your suggestion. I would prefer it dynamically update.

I did I did discover from your advice that if I start with a 3d curve and not an intersection curve it dynamically updates. If you don't know of anything else that should solve my problem? I can make that work. It's better then reclicking on each thing everytime I need to make an update.

I think I am missing something about "The patch" which you mention also. I stripped out the rest of the design and that's the start of the next part of it. It's the last thing. Or did you mean the sweep?

[TrippyLighting]

I mistyped. I meant "Path" not "patch".

Here is a screen recording that should explain how to reassign paths. It may take a while to convert on YouTube, so be patient.

https://youtu.be/GYb_YaVojdE