Draw Rectangles In Simulation

DEFAULT: DRAW RECTANGLES = CHECKED:
In the simulation operation, rectangles are drawn to show both the global rectangle (ie the overall rectangle in which everything lies), and the rectangles of the individual frames. If NO OPTIMIZATION is used, there will be only the one global rectangle. If BOUNDARIES optimization is used, there will be the global rectangle and the smaller rectangles that represent the minimum area in which the object can lie. When saved, the animated gif frame contains only that small rectangle, plus coordinates relative to the global rectangle so it is positioned correctly. Similarly if DELTAS optimization is used, there will also be a global rectangle and individual smaller rectangles. In this case the smaller rectanlges represent the deltas, differences between the current frame and the last. Naturally in cases where optimization is not possible, the global rectangle and individual frame rectanlges will be the same. The purpose of showing these rectangles, as described under the SIMULATION operation notes, is to enable you to see exactly how the settings and optimization method you use will treat your animation when you SAVE with those settings.

DRAW RECTANGLES = OFF The purpose of being able to turn the rectangles off, is to be able to review the result, without having all those rectangles mess up your view. It would give you a TRUE SIMULATION before you create the actual animated gif file.