// Initial values : center of the volume (in real world, not in pixels!)
double xSpacing, ySpacing, zSpacing;
bbGetInputIn()->GetSpacing(xSpacing, ySpacing, zSpacing);
// Initial values : center of the volume (in real world, not in pixels!)
double xSpacing, ySpacing, zSpacing;
bbGetInputIn()->GetSpacing(xSpacing, ySpacing, zSpacing);