OK I am sorry I failed to mention the ratio width : height, 2:1, thing of image, that is important caveat; but the Sphere Radius, sr, should be anything you want (within reason of screen dimensions)? did I misunderstand?
If you use a smaller image it probably takes less time? (going by what you are saying) so take the image and shrink it before submitting to the sub, if time is an issue?
If you use a smaller image it probably takes less time? (going by what you are saying) so take the image and shrink it before submitting to the sub, if time is an issue?
b = b + ...