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# surfaceCreateCmd.cpp

    //-
    // ==========================================================================
    // Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
    //
    // Use of this software is subject to the terms of the Autodesk
    // license agreement provided at the time of installation or download,
    // or which otherwise accompanies this software in either electronic
    // or hard copy form.
    // ==========================================================================
    //+

    #include <maya/MStatus.h>
    #include <maya/MObject.h>
    #include <maya/MFnPlugin.h>
    #include <maya/MDoubleArray.h>
    #include <maya/MPointArray.h>
    #include <maya/MPoint.h>
    #include <maya/MFnNurbsSurface.h>
    #include <maya/MString.h>
    #include <maya/MPxCommand.h>

    #include <maya/MIOStream.h>
    #include <math.h>

    class surfaceCreate : public MPxCommand {
    public:

                        surfaceCreate();
        virtual         ~surfaceCreate();

        virtual MStatus doIt( const MArgList& args );

        static void*    creator();
    };

    #define NUM_SPANS        30
    #define WIDTH            10.0
    #define VERTICAL_SCALING 4.0

    surfaceCreate::~surfaceCreate() {}

    surfaceCreate::surfaceCreate() {}

    void* surfaceCreate::creator()
    {
        return new surfaceCreate();
    }

    MStatus surfaceCreate::doIt( const MArgList& )
    //
    //  Description:
    //      Plugin command to test Selection List Iterator.
    //
    //
    {
        // Set up knots
        //
        MDoubleArray knotArray;
        int i;
        // Add extra starting knots so that the first CV matches
        // the curve start point
        //
        knotArray.append( 0.0 );
        knotArray.append( 0.0 );
        for ( i = 0; i <= NUM_SPANS; i++ ) {
            knotArray.append( (double)i );
        }
        // Add extra ending knots so that the last CV matches the curve end point
        //
        knotArray.append( (double)i );
        knotArray.append( (double)i );

        // Now, Set up CVs
        //
        MPointArray cvArray;

        // We need a 2D array of CVs with NUM_SPANS + 3 CVs on a side
        //
        int last = NUM_SPANS + 3;
        for ( i = 0; i < last; i++ ) {
            for ( int j = 0; j < last; j++ ) {
                MPoint cv;
                cv.x = (((double)(j))/((double)(NUM_SPANS + 3)) * WIDTH)
                    - (WIDTH/2.0);
                cv.z = (((double)(i))/((double)(NUM_SPANS + 3)) * WIDTH)
                    - (WIDTH/2.0);
                double dist = sqrt( cv.x*cv.x + cv.z*cv.z );
                cv.y = cos( dist ) * VERTICAL_SCALING;
                cvArray.append( cv );
            }
        }

        // Create the surface
        //
        MFnNurbsSurface mfnNurbsSurf;

        MStatus stat;
        mfnNurbsSurf.create( cvArray, knotArray, knotArray, 3, 3,
                             MFnNurbsSurface::kOpen, MFnNurbsSurface::kOpen,
                             true, MObject::kNullObj, &stat );

        if ( MS::kSuccess != stat )
            cerr << "surfaceCreate failed: status " << stat << endl;

        return stat;
    }

    MStatus initializePlugin( MObject obj )
    {
        MStatus   status;
        MFnPlugin plugin( obj, PLUGIN_COMPANY, "3.0", "Any");

        status = plugin.registerCommand( "surfaceCreate", surfaceCreate::creator );
        if (!status) {
            status.perror("registerCommand");
            return status;
        }

        return status;
    }

    MStatus uninitializePlugin( MObject obj )
    {
        MStatus   status;
        MFnPlugin plugin( obj );
        status = plugin.deregisterCommand( "surfaceCreate" );
        if (!status) {
            status.perror("registerCommand");
            return status;
        }

        return status;
    }