Linedef type 10
Linedef type 10, Culling Plane, is a type of linedef special which creates an invisible plane within any tagged sector. This effect halts rendering of any sprites or FOFs above or below this plane in the sector. This effect is useful if you have an indoor level with multiple floors and the game is lagging from rendering a lot of sprites and FOFs that you can't see from the current floor.
Currently, none of the default levels in SRB2 use this effect.
The height of the culling plane is determined by the floor height of the control sector. If Flag  / Not Climbable is active, the player's camera is required to be inside one of the sectors tagged by this linedef in order for the culling effect to show.
- Example file: ex_ld010_cullingplane.wad (MAP01)
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