unwanted bezier curve

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robjuda
Junior Member
Posts: 14
Joined: Wed Jul 04, 2012 10:01 pm

unwanted bezier curve

Postby robjuda » Thu Jun 22, 2017 11:22 am

Snap_02.jpg
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I use the latest Qcad, windows 7 home

I make a spline with SL, Then remove some overlapping lines with D2. After that, the spline become a Bezier curve, and I cannot add or remove points on it anymore :( (with NI and NR)

How to keep the spline after editing??

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andrew
Site Admin
Posts: 5318
Joined: Fri Mar 30, 2007 6:07 am

Re: unwanted bezier curve

Postby andrew » Thu Jun 22, 2017 11:49 am

I can confirm this limitation. Unfortunately, it is not possible to trim or split a spline with fit points (left) without converting it to a spline with control points (right) in the process.

Note that you are still looking at a spline, but it no longer uses fit points. As far as I know it is not mathematically possible to create a new spline with fit points to represent the exact result of a split or trim operation. If you drag and drop the end point instead, you might get a satisfactory result, depending on your use case. In any case, you will likely create a slightly different spline if you do this.

robjuda
Junior Member
Posts: 14
Joined: Wed Jul 04, 2012 10:01 pm

Re: unwanted bezier curve

Postby robjuda » Thu Jun 22, 2017 2:00 pm

thank you for the explaination.


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