Depth (Slide) [Optional]
Depth of perspective (3d) view, to enable 3d view of layers in a slide, this option should be specified.
For example, 0.25 means 25% of slide size. Given a slide with size 1000px x 400px, the perspective is (1000 + 400) / 2 * 0.25 = 175px.
This option affects appearance of layer applied with 'Rotate X' or 'Rotate Y' or 'Translate Z' effect.
Note that there is minor issue of a few old browsers with 3d perspective view. But 3d transition of 'Rotate X', 'Rotate Y' and 'Translate Z' are safe for individual layer even without 3d perspective view.