在MAYA8.5中做一条曲线的例子：

#include <math.h>
#include <maya/MSimple.h>
#include <maya/MFnNurbsCurve.h>
#include <maya/MPointArray.h>
#include <maya/MDoubleArray.h>
#include <maya/MPoint.h>
#include <maya/MIOStream.h>
DeclareSimpleCommand( helix, "zangyanan", "8.5");
MStatus helix::doIt( const MArgList& args )
{
MStatus stat;
const unsigned deg = 3; // Curve Degree
const unsigned ncvs = 20; // Number of CVs
const unsigned spans = ncvs - deg; // Number of spans
const unsigned nknots= spans+2*deg-1; // Number of knots
double radius = 4.0; // Helix radius
double pitch = 0.5; // Helix pitch
unsigned i;
// Parse the arguments.
for ( i = 0; i < args.length(); i++ )
if ( MString( "-p" ) == args.asString( i, &stat )
&& MS::kSuccess == stat)
{
double tmp = args.asDouble( ++i, &stat );
if ( MS::kSuccess == stat )
pitch = tmp;
}
else if ( MString( "-r" ) == args.asString( i, &stat )
&& MS::kSuccess == stat)
{
double tmp = args.asDouble( ++i, &stat );
if ( MS::kSuccess == stat )
radius = tmp;
}
MPointArray controlVertices;
MDoubleArray knotSequences;
// Set up cvs and knots for the helix
for (i = 0; i < ncvs; i++)
controlVertices.append( MPoint( radius * cos( (double)i ),
pitch * (double)i, radius * sin( (double)i ) ) );
for (i = 0; i < nknots; i++)
knotSequences.append( (double)i );
// Now create the curve
MFnNurbsCurve curveFn;
MObject curve = curveFn.create( controlVertices, knotSequences, deg,
MFnNurbsCurve::kOpen, false, false,
MObject::kNullObj, &stat );
if ( MS::kSuccess != stat )
cout << "Error creating curve./n";
return stat;
}

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