spline in circular pattern - loses handlebar settings

[maker9876]

I just tried to rotate a spline curve in a circular pattern.

Referring to screenshot below.

Spine curve - marked "A".

Circular pattern: marked "C" - 8 repetitions of 45 degree segment = full circle and completes a profile

HOWEVER notice that the curved shape of the spline has not been respected around the profile?

One of the segments has been clicked upon (marked "B") and there notice the angle of the "handlebars" compared to those of the original?

Feature, bug or workaround?

[maker9876 · Accepted solution]

oh, I understand now. The answer is in the image above.

Two of the splines had handlebars set as Tangents - those are the handlebar settings that were "lost". That makes sense.

One of the spline points had handlebars that were not tagged to anything. It looks as though those have been retained.

False alarm.

[dzid_]

No, it doesn't make sense to me. 

Even if you manually set the handles and it will replicate the shape around, you still cannot modify them all using the original spline. 

To me it is a bug. I don't see a way to create a pattern that would follow modifications of the original spline. 

[HughesTooling]

@jeff_strater Would this be considered a bug? I've attached the design pre patterning. Note in the screencast editing the pattern after editing the spline looks like it's going to update but fails when I click OK.

Mark

[HughesTooling]

I've made a post on the support forum after try to set this up using a control point spline, see here. It does work and allow editing the pattern but it is a bit difficult to setup and edit.

Mark

[therealsamchaney]

It's been 5 years since this post and still this bug persists. When doing a circular pattern of a spline, Fusion does not capture or update handle size or angles, only the handle position. This seems like a massive coding oversight. Autodesk please fix this! The circular pattern should capture and continuously update all data needed to define any sketch element. Weirdly, this problem doesn't happen with the mirror tool. Mirrored splines work just fine, which allows us to do a workaround for even numbers of rotation.

With that in mind, as a workaround, I would suggest just making a construction line polygon shape with the number of sides you want to repeat, then making radial construction lines from the center to each corner (if it has a lot of sides then you can use the circular pattern tool to achieve this). Then, make your spline where and how you want it, then just do a mirror operation in the sketch and use one of the radial construction lines as the mirror line. Then just repeat the mirrors until you get half of the shape then do a final mirror to complete it thus giving you a full "circular pattern". Unfortunately this will of course only work on even numbered shapes like hexagons or octagons.

[davebYYPCU]

@therealsamchaney You are not seriously recommending sketch mirrors on top of sketch mirrors?

Make one and pattern odd or even numbers, especially if the pattern count is to be parametric.

@maker9876 did not say what he wanted to make from the sketch, so went with surface for clarity.

Might help....