Trouble editing a spline

[djlunty]

I have drawn a fit point spline and can't edit the points or or the tangent handles.  I don't know what I did to cause this problem as I have other files that I can edit splines in.  The spline that I can not edit is in "Sketch 1" in "stand extension". 

Also when editing the tangent handles for splines is there a way from stopping them from being changed symmetrically?  Change the length of the each end of the tangent handle a different amount?

Doug

[TheCADWhisperer]

@djlunty 

Not sure what is going on here,

I am not able to click and drag the points, but I am able to edit by dimensioning location and magnitude/angle of the point handles.

[HughesTooling]

Seems like these 2 tangent constraints are causing the problem but I don't know why.

[HughesTooling · Accepted solution]

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@djlunty wrote:

Also when editing the tangent handles for splines is there a way from stopping them from being changed symmetrically?  Change the length of the each end of the tangent handle a different amount?

Doug

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No. The only way in Fusion is to use 2 splines. I know some programs allow non symmetrical handles but if you import an SVG with non symmetrical handles it gets split into 2 splines.

[djlunty]

@TheCADWhisperer 

Weird that the spline can only be adjusted by inputting distances rather than dragging points.

@HughesTooling 

Also weird that the tangents that you identified as a possible problem are not part of the splines

Could not figure out the problem so just redrew as tangent arcs.  Splines seem to be a bit finicky from time to time.  This is not the first time I have had this problem.

Thank you both for having a look.

Doug

[djlunty]

@TheCADWhisperer 

@HughesTooling 

The problem was the two coincident constraints where the splines touched a previously drawn curve.  The constraints would have been created when I trimmed the linework between the two splines.  Removing the constraints allowed the splines to be edited by dragging the spline points.

Doug

[laughingcreek]

@Phil.E - this looks like one of several seeming related spline bugs that have been floating around since time immemorial.  my guess is they're not even on the sketch teams radar anymore.

[Phil.E]

@laughingcreek The problem is the same as reported in FUS-64376 by @jeff_strater a couple years ago, I guess that's a little bit immemorial 😁. When fit point splines are coincident with projected geometry like this, it creates this condition. The sketch team has the ticket open, I just added more notes and asked them to look at it again.