The `RL_CULL_DISTANCE_` definition remains as the initial value
of the variables.
Basic usage can be:
```c
#include <raylib.h>
#include <rlgl.h>
rlSetClipPlanes(RL_CULL_DISTANCE_NEAR, MY_CULL_DISTANCE_FAR);
if (must_reset_clip_planes)
rlSetClipPlanes(RL_CULL_DISTANCE_NEAR, RL_CULL_DISTANCE_FAR);
```
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