Scroll_Texture_Left — scrolls the textures on a line left.
Scroll_Texture_Right — scrolls the textures on a line right.
Scroll_Texture_Up — scrolls the textures on a line up.
Scroll_Texture_Down — scrolls the textures on a line down.
Scroll_Texture_Left (speed); Scroll_Texture_Right (speed); Scroll_Texture_Up (speed); Scroll_Texture_Down (speed);
Scroll_Texture_Left ( speed // speed to scroll left at ); Scroll_Texture_Right ( speed // speed to scroll right at ); Scroll_Texture_Up ( speed // speed to scroll up at ); Scroll_Texture_Down ( speed // speed to scroll down at );
These specials can only be used on a line, and you cannot use SetLineSpecial to place any of them on a line after the level has been loaded.
When you use these specials to scroll a texture, the effect is permanent. If you want to adjust a line's scrolling while a level is in play, you can use the Scroll_Texture_Both special.
These specials also scroll every texture on a line—upper, middle, and lower textures.
The standard Doom line type 48 (scroll left) is equivalent to this:
The BOOM line type 85 and Heretic line type 99 (scroll right) are equivalent to this: