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;
}