Full Version: Convert Control Points to Points ?

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Hi STEFAN,

I was referring to openNURBS SDK.

https://www.rhino3d.com/opennurbs

- Brian

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<< (but i can't upload the picture to show you, because of an error i get)

Normaly image must be directly appears on the forum! ???
I had nothing made different than the other hundred images that I previous posted! :)

About the CTRL Points / REAL Geometric Points, Mac is different than PC ?

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Thank you Brian for the pointer!

I still don't get it however why someone requested an extraction of control points
from a .3dm (NURBS?) file. :-)

@Pilou maybe i have reached my posting limit, for posting attachments... ;-)

Regards
Stefan

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Ah I had believed that was mine! :)

So try https://postimages.org I use it in free from decade without problem! :)

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> About the CTRL Points / REAL Geometric Points, Mac is different than PC ?

I just tested it on my Notebook with a sphere, like i have shown with my picture,
and it works also with MoI 3.0 under Windows7 Professional.

Hopefully Michael or someone else can give you better help, because i run
out of ideas.. :-)

Regards
Stefan

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<< I still don't get it however why someone requested an extraction of control points
from a .3dm (NURBS?) file.

I'm living proof of that! :)
For me they don't work like geometric points inside some plugins! :)

But I am curious of what do you obtain when you use the Menu "Type" Points of your "Control Points" copy Pasted?
Normally nothing but who knows...

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Well..., when i copy and paste my Control Points i get on Mac and Windows Points.

When you look again at my picture carefully you see in the right menu points.

BTW. Michael says the same in the Hidden Secrets section!

http://moi3d.com/wiki/Hidden_Secrets

Regards
Stefan

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Ok That works!
So for convert Controls Points in Geometric Points just copy Past in the Clip Board! :)

I don't know what i did before for no successful that!

In fact I copied / Moved the Control Points selected : seems it's not the same than copy to clipboard because curve is always living!

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Hi Pilou,

we spend now the whole day to solve this problem... :-)

And i thought that my postings, even if i am no native
English speaker, were clear enough compared to the short
explanation in the secret section...

Regards
Stefan

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Maybe but with that we avoid to make a new plugin! :)
And that Copy Move Control Point of a curve (even this curve itself is not selected) is different than Copy to the ClipBoard! :)

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Hi Pilou, yes as Stefan has been saying selecting a curve's control points and then using copy/paste (ctrl+c/ctrl+v) will create point objects at those locations and those will work in the scene browser Types section.

- Michael

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Yes! :)

Now convert Points to Control Points is the new challenge!

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Hi Pilou,

> In fact I copied / Moved the Control Points selected : seems it's not the same
> than copy to clipboard because curve is always living!

Yes that's correct - using the Transform > Move or Transform > Copy commands with curve control points selected will transform the curve. To duplicate the points you need to use the Edit > Copy and Edit > Paste instead.

- Michael

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> Now convert Points to Control Points is the new challenge!

Use SavePointFile to write the point objects to a text file (use the OSX version even for Windows):
http://kyticka.webzdarma.cz/3d/moi/#SavePointFile

Then use ImportPointFile to read in the points, it has an option to make a curve out of them:
http://kyticka.webzdarma.cz/3d/moi/#ImportPointFile
again use the updated version that works with OSX, the original versions of these only work with MoI v2, the ones updated to use MoI's built in cross platform functions for reading and writing text files will work on MoI v3/v4 on both Mac and Windows.

One thing to note though is that the ordering of the points is significant when making a curve out them.

- Michael

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Super! Bravo!
Seems that was yet existing!
So...:)

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Hi Franz,

re:
> I also have a question about that:
> Is it possible to show (and use) the points with which the curve is
> drawn, but not the controll-points?

Sorry no there isn't currently any way to do that. I want to make that possible in the future though possibly by some more history functions.

- Michael

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Hallo Michael!

Thank you for your feedback.
In fact, a subsequent display and editing function of a "curve of points" might be interesting for corrections.
This is often only partially possible with "rebuild", because few points are not sufficient and too many points are tedious for correcting a curve.

Franz

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Hi Michael!

I tried this one, working well, but the getting curve is not the same.
Franz

Image Attachments:
ImportPointsThroughpts.jpg 

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Hi Franz,

maybe you could try out this, saving your curve as .dfx poly line, re-importing into MoI
and then rebuild with standard refit option. It gives you slightly more controls points,
but not to much IMHO and i think it best represents the original curve.

Regards
Stefan

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Hi Stefan!

Thank you for your feedback. But that is not quite my concern.
It is clear that by increasing the number of points the curve becomes more accurate.
But it would be nice to correct a curve not only at the control points, but also at the points where it was originally drawn.
I think that's a very fundamental question. It would be nice to only have to move these points to correct the curve.

Now I can only see the possibility to draw points for a curve before, then trace the curve after it with the function "through pts".
With a correction after the drawn points you would have to draw the curve again.
To do this, the option contained in the ImportPointFile script to rebuild the curve after the points would be good.
Or is there a function "Build curve by points"?

best regards
Franz

Image Attachments:
CurveThroughPoints.jpg 

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