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# surfaceCreate.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/MDoubleArray.h>
    #include <maya/MPointArray.h>
    #include <maya/MPoint.h>
    #include <maya/MFnNurbsSurface.h>
    #include <maya/MString.h>
    #include <maya/MFileIO.h>
    #include <maya/MLibrary.h>
    #include <maya/MIOStream.h>
    #include <math.h>

    MStatus makeSurf();

    int main(int /*argc*/, char **argv)
    {
        MStatus stat;

        stat = MLibrary::initialize (argv[0]);
        if (!stat) {
            stat.perror("MLibrary::initialize");
            return 1;
        }

        MString fileName("surf1.ma");

        stat = makeSurf();
        if (!stat)
            return 1;

        cout << ">>>> Attempting save as surf1.ma <<<<\n";
        stat = MFileIO::exportAll(fileName, "mayaAscii");
        if (stat)
            cout << ">>>> Save Successfull <<<<\n";
        else {
            cout << ">>>> Save Failed <<<<\n";
            stat.perror("exportAll");
        }

        MLibrary::cleanup();

        return 0;
    }

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

    MStatus makeSurf()
    {
        cout << ">>>> Start creation of test surface <<<<" << endl;

        // 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 ( stat ) {
            cout << ">>>> Test Surface Creation Successfull <<<<\n";
        } else {
            stat.perror("MFnNurbsSurface::create");
            cout << ">>>> Test Surface Creation Failed <<<<\n";
        }

        return stat;
    }