Roll

The transition from Clip A to Clip B occurs as A frame is Rolled out of view revealing B, or B is rolled in over A covering it in the opted direction

trans.Roll(clip, clipb clip[, float overlap = 1.0 ][, int dir = 1][, int rollin = 1])

Parameter description:
clip : A clip. Constant format.
clipb : B clip. Must have identical format of A clip
overlap : transition time length in seconds. Floating point. Must correspond to at least 8 frames for each turn
dir : 1 to 8 corresponding to 1 for N through 8 for NW in clockwise direction.
rollin : If set to 1 B rolls in over A. If set 0, A is rolled up revealing B

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