#include <NINJA.H> 
void njLightOn( *ptr )
NJS_LIGHT *ptr

#include <NINJA.H> 
...........

NJS_LIGHT light;

njInitSystem();
njCreateLight(&light, NJD_DIR_LIGHT);
...........
/* 平行光源を消灯 */
njLightOff(&light);
...........
/* 平行光源を点灯 */
njLightOn(&light);