Spline Scaling

[Anonymous]

Is there a way to successfully scale an edited spline. Attached, a short screencast indicating the problem.

Any help would be much appreciated.

Regards

John

[TrippyLighting]

Extrude a surface from the spline and scale that. Then use the edge of the scaled surface for whatever you would have used a scaled spline for. 

[Anonymous]

If someone still have troubles with this, try to fix the modified handles and then scale the sketch. Once scaled, you can unfix the handles and continue. Should work.

Regards

[Anonymous]

Indeed, it does work. Still requires some time to carry out especially
for those splines with many nodes. At least we have two work arounds now.

Regards,
John Rattey

[Anonymous]

Indeed, it does work. Still requires some time to carry out especially for those splines with many nodes. At least we have two work arounds now.

Regards,
John Rattey

[MichaelT_123]

Hi Mr GustavoKYU8 and Fellows

Please find screencast of "scaling spline". The term which should be treated as a shortcut for scaling spline's node points positions, in reality, modifies the original function (its parameters).  The scaling shown in the demo can be used for other more or less exotic modification of the spline curve.

Regards

MichaelT

Screencast will be displayed here after you click Post.

33dc2d55-6c9f-471a-a32c-e7b5ebdd2049

[Anonymous]

Hi Michael. no screencast available??

Regards

John

[TrippyLighting]

Yep, but that is a very frequently occurring issue with the forum web site. It states the the screencast will appear after the message is posted but that often does not happen.  This is why I use s different method of inserting screencasts into posts.

When I get the link per email, I'll follow it and then select the "embed" button, which opens a little window with the HTML code. I copy that code.

Then in the forum message I select the HTML tab and paste the code there. This has worked for me 100%

These recurring issues are a testament don't inspire a lot of confidence in the company that AD has outsourced the Forum to. I'll tag @brianrepp in case this particular issue has not been brought to their attention.

[MichaelT_123]

Hi Mr GustavoKYU8 and Fellows

 Re-posted, as something in 5D went wrong!

Please find screencast of "scaling spline". The term which should be treated as a shortcut for scaling spline's node points positions, in reality, modifies the original function (its parameters).  The scaling shown in the demo can be used for other more or less exotic modification of the spline curve.

It should be noted that the method is only applicable to 2D flat splines and although the extension of it to 3D is possible, it is so cumbersome that could be only prescribed to a terminally ill CAD addict.

Using this occasion, I am pleased to bring to the attention of TF360 that 3D dimensions in the 21st century should be considered normal and even 4D approach would not be a significant stretch of imagination of many.

Video          - https://a360.co/2MdI4ls

Regards

MichaelT

[Anonymous]

Seems to work well, but again it is a work-around which will become cumbersome for many node points. Maybe someone could write a small script to achieve an acceptable result. Not in my field of current knowledge.

Regards

John

[Anonymous]

I agree. I´m a luthier and cnc hobbyst but work in apps development for many years. One thing that is important about an app is that it should behave as expected. If a user clics a window cross, it should close, otherwise the user get confused and fell not confortable with the app.

In this case, in my opinion, if I select an entire scketch and scale it, should get the same form bigger or smaller. Maybe if I select only some lines or splines could get a diferent result.

Im a programmer but dont know about fusion scripting, I will take a look and see if I can do something with that.

For now, when I draw a sketch and I know that I will need diferent sizes of it, I fix the handles as a mofidify them in my workflow

[TrippyLighting]

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@MichaelT_123 wrote:

I am pleased to bring to the attention of TF360 that 3D dimensions in the 21st century should be considered normal

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Welcome to the club 😉

[Anonymous]

Hi there,

I'm having the exact same issue here as others obviously before. Created a spline in the first step and now trying to setting its desired dimensions is impossible as scaling messes the spline up when going bejond factor 1.2. Is there any progress on a fix for this?

br,

Stefan

[TrippyLighting]

No and it is unlikely to happen.

[Claus_J]

According to @jeff_strater scaling splines is not a normal workflow and allthough the behavior is considered a bug it will not be fixed. I guess everyone who find this unacceptable should make their opinion known.

I did find a workaround that is relatively easy. You make lines that constrain to the spline nodes and scale the lines in stead of the spline itself. Due to the constrains the spline will follow and the shape is preserved.

https://forums.autodesk.com/t5/fusion-360-design-validate/scaling-fit-point-spline-strange-handle-be...

[cookiecrumblekid]

Can't say this will work for everyone's situation. I often have to trace logos and have hundreds of spline points that I cannot possibly have time to fully define. Here is one more workaround that I use and works well for my purposes, maybe it will help you too.

*** Update:
Well, I can't seem to embed screencasts and I can't delete comments and start over so I'll just edit this one and include the link.

https://autode.sk/3c8TvtM

[cookiecrumblekid]

oops, forgot to click insert on screencast

[TrippyLighting]

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@cookiecrumblekid wrote:

Can't say this will work for everyone's situation. I often have to trace logos and have hundreds of spline points that I cannot possibly have time to fully define.

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I briefly looked at your screencast and would say you generally use way too many spline points.

What I do is that when I am done with one spline, I use the fix constraint. Then I move to the next spline.

[cookiecrumblekid]

Everyone's a critic. Good thing the question wasn't about how many spline points were necessary or not.

[TrippyLighting]

It wasn't about how to constrain a splines either 😉

[cookiecrumblekid]

Then it's a good thing my end result was showing how to successfully scale troublesome splines, that may or may not have too many points, easily and quickly just as OP wanted. Constraining the spline temporarily was part of the journey, not the ultimate result, nor even the main point of the example. And despite the alleged poor sketch technique, I still got it done, even better. Should work great for splines with less points.