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From: geekmidget (HF)
OK So I made another related test, I used a circular array of points following an arc of 90 degrees (I added some markers for visualizing alignment), then used the freeform through points and the resulting 90 degree arc didn't respect points. So this isn't so much a trim issue as an interpolation issue.
Image Attachments:
90deg_arc_using_points.png
90deg_points.png
From: Frenchy Pilou (PILOU)
As said previously you can't use Control Points as real Geometric Points!
From: geekmidget (HF)
I thought in the case I made a freeform curve using actual points they would be respected.
From: Michael Gibson
Hi geekmidget,
re:
> I thought in the case I made a freeform curve using actual points they would be respected.
It will be if you use Draw Curve > Freeform >
"Control points".
In that case the points you pick directly become the NURBS control points of the resulting curve.
That won't be the case if you use "Through points", which calculates a curve that passes through the points you pick. The control points of the resulting curve will not be the same points that you picked, they will be the result of the interpolation calculation.
NURBS curves do not inherently pass through all their control points.
- Michael
From: geekmidget (HF)
I see, that naming seems counter-intuitive to me, but thanks! Now I get it.
From: Michael Gibson
HI geekmidget,
You seem to be trying to use the edit points as a diagnostic tool.
That's not really what they are intended to do.
In MOI the edit points are meant to provide a way to deform a curve. Since the regular NURBS control points for a precise circle or arc do not deform smoothly, there is a curve rebuild process applied to edit points. The rebuilt curve will be used if you move some of the points around.
re:
> I understand this but in both cases (270 degrees and 300 degrees) there are control points falling somewhere between two lines,
No that's not quite correct, the 300 degrees has "actual NURBS control points" like this:
And the 270 degree has this:
The 270 degree does not have any fully multiple knots interior to a trim span, they're all at the end of a span.
The 300 degree one has 2 spots where a fully multiple knot is internal to a trim instead of at the ends of a trim, those are the spots where the rebuild points will get 4 edit points.
> Sorry I was trying to reply Michael but I don't know how to use quoting in this forum
> UI. Is it supposed to be done manually?
Yes. You can put the quote inside <quote></quote> if you want.
- Michael
Image Attachments:
arc_edit_points5.png
arc_edit_points6.png
From: Michael Gibson
Hi geekmidget,
re:
> I see, that naming seems counter-intuitive to me, but thanks! Now I get it.
Well, with the "control points" method the points you pick directly become the NURBS control points, I don't follow how that's counter-intuitive.
- Michael
From: geekmidget (HF)
Try to watch the UI from the perspective of someone relatively new to MoI3D who just sees the icons and names of tools, not realizing the internals.
Image Attachments:
freeform_method_icons.png
From: geekmidget (HF)
quote:
You seem to be trying to use the edit points as a diagnostic tool.
Actually I was trying to get the curve to follow the points precisely in the plane XY first to then assign each a Z value.
quote:
You can put the quote inside [...]
Thank you!
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