is it possible to change the smooth point of a curve to a corner, and the other way around? The way I do it now is by placing a new point very closely to the existing one, and then delete the old one, but that is a cumbersome technique, while the curve goes bezerk then, and has to be readjusted.

tnx
wim

Hi wim, the only way to do it currently is the way that you described with adding in a new corner point and deleting the old smooth point.

It's on my list to add some easier way of switching the types of existing points.

But I'm not sure if that will help you with the "curve goes berzerk" problem, most likely an easier switching method will still have the same behavior that you're seeing now.

Can you post an example that shows what you are describing there?

- Michael

Hi Michael,

here is an example, see the red circle. the curve is not following the mathematical direction of the handles, but stays close to the control point.

tnx
Wim

Hi Wim - that kind of result is due to getting non-uniform knot spacing.

When you insert a control point there are 2 modes that you can use, if you have control points turned on you can click on one of the lines of the control polygon hull and it will insert a control point in that location, and the other control points will stay in the same spots. The curve will shift slightly in shape to accomodate the new control point structure, but this is probably what you want, it's closer to what you would get if you had added that point when you originally drew the curve.

If you do not have control points turned on you can click directly on the curve (instead of on a control polygon hull line) and that will do a slightly different kind of insertion, adding a "knot" into the curve. For this kind of insertion, the shape of the curve remains exactly identical to its previous shape and instead the locations of the control points will shift. But this mode can end up with the kind of thing that you're showing htere where the curve is more strongly influenced by one control point location due to the spacing of the knots.

It's a bit hard to describe how the knot spacing works, but basically if you want things to behave more like how the control point curve drawing command works you probably want to have control points turned on when you insert the point and click on the control polygon hull to use the first mode of insertion rather than the insert knot method.

- Michael