##### Ninja Library - Light Function

# njUnitLightMatrix

Converts a light matrix into a unit matrix

### FORMAT

`

  void njUnitLightMatrix( *ptr )
  NJS_LIGHT *ptr

`

### PARAMETER

  `*ptr` | Pointer to light source

### RETURN

  None

### DESCRIPTION

  Converts a lights matrix registered by `njCreateLight()` into a unit matrix, enabling calculation of the position and direction of the light source.

### EXAMPLE

      #include <Shinobi.h>
      	:
      NJS_LIGHT light;
      sbInitSystem( NJD_RESOLUTION_VGA, NJD_FRAMEBUFFER_MODE_RGB565, 1);
      njCreateLight(&light, NJD_POINT_LIGHT);
      	:
      njClearMatrix();
      /* Make light matrix the unit matrix */
      njUnitLightMatrix(&amp;light);

### NOTE

  Light source needs to be specified in `njCreateLight()` and `njClearMatrix()` needs to be called beforehand.

### REFERENCE

  `njCreateLight()
  `

njUnitLightMatrix

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