Hi Pilou,

> I use Rebuild for give the same number of control points
> of the circle, (or any other figure)

Why would you do this though? There is no need to make those curves have the same number of control points in them.

For matching segments of a one curve to another it is the number of segments that matters, not the number of control points.

Each segment in the cross piece will be matched to a fragment of the circle, this will happen no matter how many control points are in the circle or in the pieces of the cross.

If you want to control how a piece of the cross matches with the circle, then you need to use the Trim command to split the circle up into 16 pieces to match the 16 segments of the cross - to do this you would use the Trim command, not anything to do with control points.

- Michael

Also I don't see what is wrong with your sweep that you are trying to change - it seems like a good result already...

- Michael

< But it seems that you're worried about making an equal number of control points which is a much different thing than an equal number of segments...
seems yes :)

< Also I don't see what is wrong with your sweep that you are trying to change - it seems like a good result already.
yes they are good but seems they don't perfect overlap due my test of different number of Control points on the circle!

Have you maybe been using some sweep or lofting tools recently in a polygon modeling program, like some of those SketchUp plug-ins or something like that, where you might need to be concerned about the particular number of points in the curves?

That's a kind of different situation, because in a polygon modeler you don't have a real curve and the number of control points also basically controls the number of segments within the curve since they're just lines in between each control point.

In a NURBS modeler like MoI that's not the same kind of a case - the number of control points in the curve and the number of sub-segments the curve is made out of are separate things.

- Michael

Hi Pilou,

> yes they are good but seems they don't perfect overlap due
> my test of different number of Control on the circle!

If you want them to perfectly overlap, then you need to control the segmentation of the circle so that you will have a specific match for each piece of the cross to one piece of the circle.

So that means split the circle up into 16 segments using the Trim command - it doesn't have anything to do with making an equal number of control points!

- Michael

Yes seems that is my confusion but rich of learning for the circle (symetric figure)
It don't gives the same result following his number of Control points (over the 12 by default)!

And of course for segments / Control Points :)
Thx for All !

Hi Pilou,

> It don't gives the same result following his number
> of Control points (over the 12 by default)!

Yes, the "automatic segmentation" of the circle to match the 16 segments of the cross is slightly different between the original and the rebuilt circle.

That has to do with some various properties of the curve like its internal parameterization, you may also see a difference depending on which loft mode you use - either "Exact" or "Refit" for profiles.

But in either case if you want to control it specifically you can split the circle up into 16 pieces and that will then control how each piece of the cross maps to each piece of the circle. If the 2 curves have the same number of segments then it will match each segment to the other instead of doing an automatic segmentation of the circle.

- Michael

All seems very clear now :)