This function doesn't work in editor mode. When zbuffer is off
get YES or NO. zbuffer is the name of the algorithm that is often used to solve
the hidden surface removal problem. If NO is given the engine will use
BSP algorithms (binary space partitions) the BSP algorithms are faster
and more accurate most of the time. There are some cases where BSP algorithms will
be less accurate. Try testing both methods and see which is better for your world.
Note that using this function is equivalent to calling STATE_engine_load_world()
with (or without) the DONT_USE_ZBUFFER flag. Using this function makes it possible to change
methods at run-time.
The return value is OK or VR_ERROR (error if we try to do it in editor_mode)
The default is zbuffer ON.
example: STATE_engine_use_zbuffer(YES);
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