ecmascript:

function initialize( ) {
    generateCrossSection( );
    generateSpine( );
}

function set_crossSectionRadius( csr, ts )
{
    crossSectionRadius = csr;
//  Browser.print ('crossSectionRadius =' + crossSectionRadius);
    generateCrossSection( );
}

function set_spineRadius( sr, ts )
{
    spineRadius = sr;
//  Browser.print ('spineRadius =' + spineRadius);
    generateSpine( );
}

function generateCrossSection( )
{
    newCrossSection = new MFVec2f(); // temporary hold variable
    angle = 0.0;
    delta = 6.28 / crossSectionResolution;
    for ( i = 0; i <= crossSectionResolution + 1; i++ ) {
        newCrossSection[i][0] =  crossSectionRadius * Math.cos( angle );
        newCrossSection[i][1] = -crossSectionRadius * Math.sin( angle );
        angle += delta;
    }
    // make ends meet
    newCrossSection[crossSectionResolution + 1][0] = newCrossSection[0][0];
    newCrossSection[crossSectionResolution + 1][1] = newCrossSection[0][1];

    crossSection_changed = newCrossSection;
}

function generateSpine( )
{
    newSpine = new MFVec3f(); // temporary hold variable
    angle = 0.0;
    delta = (2 * 3.141592653) / spineResolution;
    for ( i = 0; i <= spineResolution; i++ ) {
        newSpine[i][0] = spineRadius * Math.cos( angle );
        newSpine[i][1] = 0.0;
        newSpine[i][2] = -spineRadius * Math.sin( angle );
        angle += delta;
    }
    // make ends meet
    newSpine[spineResolution + 1][0] = newSpine[0][0];
    newSpine[spineResolution + 1][1] = 0.0;
    newSpine[spineResolution + 1][2] = newSpine[0][2];

    spine_changed = newSpine;
}