沿着curve画cylinder

画几条curve，选中，然后post1，沿着curve画出5个cylinder

 

#include <maya/MArgList.h>
#include <maya/MFnPlugin.h>
#include <maya/MPxCommand.h>
#include <maya/MString.h>
#include <maya/MDagPath.h>
#include <maya/MSelectionList.h>
#include <maya/MItSelectionList.h>
#include <maya/MGlobal.h>
#include <maya/MFnNurbsCurve.h>
#include <maya/MPoint.h>

// Use helper macro to register a command with Maya.  It creates and
// registers a command that does not support undo or redo.  The
// created class derives off of MPxCommand.
//
class Posts1Cmd : public MPxCommand
{
public:
    virtual MStatus doIt( const MArgList& args );
    static void *creator(){return new Posts1Cmd;}
};

MStatus Posts1Cmd ::doIt( const MArgList& args )
{
    const int nPosts = 5;
    const double radius = 0.5;
    const double height = 0.5;
    MSelectionList selection;
    MGlobal::getActiveSelectionList(selection);

    MDagPath dagPath;
    MFnNurbsCurve curveFn;
    double heightRatio = height / radius;

    MItSelectionList iter(selection , MFn::kNurbsCurve);

    for ( ; !iter.isDone(); iter.next() )
    {
        iter.getDagPath(dagPath);
        curveFn.setObject(dagPath);

        double tStart,tEnd;
        curveFn.getKnotDomain(tStart, tEnd );

        MPoint pt;
        unsigned int i;
        double t;
        double tIncr = (tEnd - tStart )/(nPosts - 1 );
        for ( i=0, t=tStart; i<nPosts; i++, t+=tIncr )
        {
            curveFn.getPointAtParam( t, pt, MSpace::kWorld);
            pt.y += 0.5 * height;
            MGlobal::executeCommand( MString("cylinder -pivot ") + pt.x + " " + pt.y + " " + pt.z + "-radius 0.5 -axis 0 1 0 -heightRatio " + heightRatio );

        }
    }
    return MS::kSuccess;
}

MStatus initializePlugin(MObject obj)
{
    MFnPlugin pluginFn(obj,"lijy","1.0");
    MStatus stat;
    stat = pluginFn.registerCommand("post1",Posts1Cmd::creator);
    if(!stat)
        stat.perror("registerCommand failed");
    return stat;
}

MStatus uninitializePlugin(MObject obj)
{
    MFnPlugin pluginFn(obj);
    MStatus stat;
    stat = pluginFn.deregisterCommand("post1");
    if(!stat)
        stat.perror("deregisterCommand failed");
    return stat;
}