Initialisation class "sphere" define the sphere size by adding isize followed by the desired size in pixel: Sphere size class "isize" - min=32 max=n default=auto vary the image by adding izoom followed by the desired zoom in percent: Image zoom class "izoom" - min=100 max=200 default=100 vary the image by adding ishift followed by the desired shift in percent: Image shift class "ishift" - min=1 ma