Spline handles Randomly non-existant

David_LaPoint

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?

john_mcclary

OnShape 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

matthew_chapman

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,
Matt

john_mcclary

OnShape 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

matthew_chapman

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,
Matt