Function CheckPointToPlane

editor/Erooms.cpp:1365–1374

Check to see if a point is in, in front of, or behind a plane Parameters: checkpoint - the point to check planepoint,normal - the plane we're checking against Returns: 0 if on the plane, -1 if behind, 1 if in front

//					planepoint,normal - the plane we're checking against
// Returns:		0 if on the plane, -1 if behind, 1 if in front
int CheckPointToPlane(vector *checkpoint, vector *planepoint, vector *normal) {
  float d = (*checkpoint - *planepoint) * *normal;

  if (d < -POINT_TO_PLANE_EPSILON)
    return -1;
  else if (d > POINT_TO_PLANE_EPSILON)
    return 1;
  else
    return 0;
}

// Check to see if all the points on a face are in front of a plane
// Parameters:	rp,facenum - the face to check