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Spline handles Randomly nonexistant
David_LaPoint
Member Posts: 10 ✭
Here I drew a closed spline, none of the points have handles to control angles off the points. Why does this happen to me now?
0
Best Answers

john_mcclary Member, Developers Posts: 3,930 PROOnShape Splines only add control handles to the start and end points. If you close the spline then you lose the start/end points. I'm not sure why it is this way, but I've found adding or removing points and I can get the shape needed.
I'd like to see what @matthew_chapman has to say on this
5 
matthew_chapman Member, Developers Posts: 4 ✭✭Thanks for the 'A2A' @john_mcclary
Handles only apply at end points where the spline is 'open'. At other points, the spline is calculated such that it passes smoothly through the points, such that a single smooth curve is created (with 1st and 2nd derivative continuity).
Given the fitting scheme that Onshape uses, a given set of points will always result in a particular curve. If the curve is not to your liking, you need to add or remove points as John suggests. Often the physical constraints of a CAD problem will dictate the points that a curve must pass through.
Hope this helps,
Matt8
Answers
I'd like to see what @matthew_chapman has to say on this
Handles only apply at end points where the spline is 'open'. At other points, the spline is calculated such that it passes smoothly through the points, such that a single smooth curve is created (with 1st and 2nd derivative continuity).
Given the fitting scheme that Onshape uses, a given set of points will always result in a particular curve. If the curve is not to your liking, you need to add or remove points as John suggests. Often the physical constraints of a CAD problem will dictate the points that a curve must pass through.
Hope this helps,
Matt