A_RockSpawn

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A_RockSpawn is an action that spawns rocks at a specified interval, which is to be used in conjunction with linedef type 12. In SRB2, this is used by the Rock Spawner.

The Angle of the actor should be the same as the tag of the control linedef with linedef type 12. The direction of the control linedef determines the angle of the rockslide. The length of the linedef determines the speed of the rocks (16 fracunits of the linedef length equal 1 fracunit per tic of speed), and the front texture X offset determines the time in tics it takes to spawn a rock (using A_SetTics). The front texture Y offset determines the sprite used for the rocks, as shown in the table below.

Y offset	Sprite prefix	Rock sprite	Description
0	ROIA		Brown rock, like the ones in Arid Canyon Zone Act 1
1	ROIB		Brownish-gray rock
2	ROIC		Gray rock
3	ROID		Bluish-gray rock
4	ROIE		Brownish-gray rock with orange spots
5	ROIF		Red rock
6–15	ROIG–ROIP	(None)	Blank slots

Checking Flag [6] / Not Climbable on the control linedef will add a random number between 0 and 8 to the speed of the rocks, in fracunits per tic.