text: // Creates a sphere with a radius of 100 in
  // the center of a 400x400x400 volume and
  // smooths it using a radius 50 Guassian blur.
  
    n = 400;
    imp = IJ.createImage("Sphere", "8-bit Black", n, n, n);
    stack = imp.getStack();
    stack.drawSphere(n/4, n/2, n/2, n/2);
    r = n/8;
    IJ.run(imp, "Gaussian Blur 3D...", "x="+r+" y="+r+" z="+r);
    imp.show();
    imp.setSlice(n/2);
    //imp.setRoi(new Line(0, n/2, n, n/2));
    //IJ.run(imp, "Plot Profile", "");
  