This function is used to enable a defined light. When you define a positional or a directional light you must assign it an index number which is then used by this function to switch the light on or off. Default is disabled (false).NOTE: There are only 8 hardware lights available, so only 8 defined lights can be enabled at any one time (although more can be defined).
Argument Description ind The index number of the light (from 0 to 7) enable Enable or disable all lighting (true or false)
draw_light_define_direction(1, 0, 1, 0, c_white);
The above code will enable lighting for the whole scene, then define a white directional light in the room space, and then finally turn that light on.