##### Ninja Library - View Function

# njRotateViewZRelative

Rotates the view location around the Z axis (relative rotation)

### FORMAT

`

  void njRotateViewZRelative( *v, ang )
  NJS_VIEW *v
  Angle ang

`

### PARAMETER

  `*v` | Pointer to view structure
  `ang` | Rotation angle (relative amount)

### RETURN

  None

### DESCRIPTION

  Rotates the view location around the Z axis by a relative angle.

### EXAMPLE

      The following rotates the location of the view located at (3000, 0, 0)
      and directed towarded (0, 0, -1) (into the screen) by 90 degrees around the Z axis,
      without changing the view location.
      #define VIEW_PX 3000.f
      #define VIEW_PY 0.f
      #define VIEW_PZ 0.f
      #define VIEW_VX 0.f
      #define VIEW_VY 0.f
      #define VIEW_VZ -1.f
      #define VIEW_ROLL 0
      NJS_VIEW v;
      v.px = VIEW_PX;
      v.py = VIEW_PY;
      v.pz = VIEW_PZ;
      v.vx = VIEW_VX;
      v.vy = VIEW_VY;
      v.vz = VIEW_VZ;
      v.roll = NJM_DEG_ANG(VIEW_ROLL);
      njRotateViewZRelative(&v, NJM_DEG_ANG(90));
      njSetView( &v );

### NOTE

  When parameter v is NULL, the current matrix is rotated.

### REFERENCE

  `njSetView()
  `

njRotateViewZRelative

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