Have you wanted to create a rockslide like in Arid Canyon Zone? The Rock Spawner (Thing 1202) is the thing used for this purpose. But alone, it cannot do anything.
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Create a cliff where you want to make the rocks spawn. Put Thing Type 1202 - Rock Spawn onto it and set its angle to whatever tag you want your control linedef to be. The special flags do nothing, except for Object Flip.
This Linedef Action is used to set the parameters for your rockslide. Its angle determines the angle of the rockslide, its length determines the speed of the rocks and the texture's X offset determines the spawn speed. The texture's Y offset determines the sprite used for the rocks. A Y offset of 0 gives you the ROID sprite just like in ACZ, 1 and 2 give you a gray stone, 3 gives you a bluish-gray rock, 4 gives you a grey rock with orange spots, 5 gives you a red rock, while 6 and up produce an error. Toy with the length and angle of your linedef and the X offset of its texture, if necessary. The linedef flags seem to do nothing, as with the floor and ceiling.
MAP01, replacing Greenflower Zone Act 1.