Transition: Iris Box

The "Iris Box" transition reveals clip B using a growing box that covers clip A.

This transition has many variations.

Drag the little circle in clip A to the point from where you want the box to start growing.
Make the border width greater than zero to draw a border around the box.
- You can choose the color of the border. The default is black.
Place a check in the "Reverse" checkbox to put clip A in a shrinking box to reveal clip B.
You can specify the amount of anti-aliasing used to soften the edges of the box. The default is "off".