 | | | Newbie - mel - Getting points, vrtx or controlpoints | Newbie - mel - Getting points, vrtx or controlpoints 2003-12-02 - By Bryan Ewert
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? 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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