 | | | Newbie - mel - Getting points, vrtx or controlpoints | Newbie - mel - Getting points, vrtx or controlpoints 2003-12-03 - By Andres Ramirez
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How about just going myObject.cv["*"]["*"]? That seemed to work for me.
Then I can use the -flatten flag with ls.
Thank you so much for all the nurb references though, that will
come in handy.
- Andres
On Tuesday, December 2, 2003, at 02:37 PM, Bryan Ewert wrote:
> ? from Tue, 2 Dec 2003 10:33:03 -0600
>
>>> So I either need to find a way to automatically select all the CV's
>>> or
>>> somehow get a list of them.
>
>> hilite -r $obj;
>> eval ("hilite -r " + $obj + ".vtx[0:2000000]");
>
> Oi. Sorry, but that's just too sloppy for me. :)
>
> The CVs on a NURBS curve are selectable via the ".cv" attribute of the
> curve. Edit points are selectable via the ".ep" attribute.
>
> To determine the number of CVs for a NURBS curve:
>
> string $curve = "curveShape1";
>
> int $numSpans = `getAttr ( $curve + ".spans" )`;
> int $degree = `getAttr ( $curve + ".degree" )`;
> int $form = `getAttr ( $curve + ".form" )`;
>
> int $numCVs = $numSpans + $degree;
>
> // Adjust for periodic curve:
> if ( $form == 2 ) $numCVs -= $degree;
>
> Thus, to select or modify all CVs on the curve:
>
> int $cv;
> for ( $cv = 0; $cv < $numCVs; $cv++ )
> {
> // The CV; e.g. "curveShape1.cv[0]"
> string $cvAttr = ( $curve + ".cv[" + $cv + "]" );
>
> // The edit point; e.g. "curveShape1.ep[0]"
> string $cvAttr = ( $curve + ".ep[" + $cv + "]" );
>
> select $cvAttr; // or whatever
> }
>
> Related MEL How-To's:
>
> How do I determine how many CVs are in a NURBS Curve or
> Surface?
>
> http://www.ewertb.com/maya/mel/mel_a58.html
>
> How can I determine the world space coordinates of NURBS
> surface edit points?
>
> http://www.ewertb.com/maya/mel/mel_a20.html
>
> If you're dealing with polygon mesh objects, you can use the
> "polyEvaluate"
> command to determine the number of vertices in the mesh:
>
> string $mesh = "pSphereShape1";
>
> polyEvaluate -vertex $mesh;
> // Result: 114 //
>
> An annoying behavior of this command is that it always returns an int
> array,
> forcing you to capture its results like this:
>
> int $numVtx[] = `polyEvaluate -vertex $mesh`;
>
> int $vtx;
> for ( $vtx = 0; $vtx < $numVtx[0]; $vtx++ )
> {
> string $vtxAttr = ( $mesh + ".vtx[" + $vtx + "]" );
>
> // Do work the $vtxAttr here.
> }
>
> You can then loop through the vertices similar to the CVs.
>
>
> Sidebar: You won't find the ".cv" or ".ep" attributes listed in the
> Connection Editor, or in the node documentation for a nurbsCurve.
> These are
> "virtual" attributes - perhaps aliases, I'm not sure how they defined
> and
> interpreted - similar to the ".vtx" and ".e" attributes on a polygon
> mesh.
> Does someone knows the story behind these?
>
> --
> Bryan Ewert ? maya@(protected) ? http://www.ewertb.com ?
>
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>
Andres Ramirez
Pixeldream Inc.
andres@(protected)
http://www.pixeldream.com
P: 201-963-6063
C: 617-413-8582
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