Vec4d HfT_osg_Plugin01_ParametricSurface::Curvature2Color(double curvature, double curvaturemin, double curvaturemax)
{
    Vec4d color;
    curvature *= 1000;
    curvaturemin *= 1000;
    curvaturemax *= 1000;

    double rotf = rot(curvature, curvaturemax);
    double gruenf = gruen(curvature, curvaturemin);
    double blauf = blau();

    color.set(rotf, gruenf, blauf, 1.);

    //fprintf(stderr,"r,g,b = %f %f %f \n",color[0],color[1],color[2]);
    return (color);
}