##### Ninja Library - Collision Function

# njGetPlaneNormal

Finds the vector that is normal to a plane

### FORMAT

`

  void njGetPlaneNormal(*p, *v)
  NJS_POINT3 *p
  NJS_VECTOR *v

`

### PARAMETER

  `*p` | Data array describing three points in the plane
  `*v` | Normal vector to the plane

### RETURN

  None

### DESCRIPTION

  Finds the vector that is normal to a plane.

### EXAMPLE

      The following finds the vector that is normal to the plane passing
      through points (1, 2, 3), (1, -1, 2), and (2, 3, 1).

      NJS_POINT3 p[3];
      NJS_VECTOR v;
      p[0].x = 1.f;
      p[0].y = 2.f;
      p[0].z = 3.f;
      p[1].x = 1.f;
      p[1].y = -1,f;
      p[1].z = 2.f;
      p[2].x = 2.f;
      p[2].y = 3.f;
      p[2].z = 1.f;
      njGetPlaneNormal(p, &v);
      % Result %
      v (7, -1, 3)

njGetPlaneNormal

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