intersectsPlane method

bool intersectsPlane(Plane plane)

plane - page:Plane to check for intersection against.

Determines whether or not this box intersects plane.

Implementation

bool intersectsPlane(Plane plane) {
  // We compute the minimum and maximum dot product values. If those values
  // are on the same side (back or front) of the plane, then there is no intersection.

  double min, max;

  if (plane.normal.x > 0) {
    min = plane.normal.x * this.min.x;
    max = plane.normal.x * this.max.x;
  } else {
    min = plane.normal.x * this.max.x;
    max = plane.normal.x * this.min.x;
  }

  if (plane.normal.y > 0) {
    min += plane.normal.y * this.min.y;
    max += plane.normal.y * this.max.y;
  } else {
    min += plane.normal.y * this.max.y;
    max += plane.normal.y * this.min.y;
  }

  if (plane.normal.z > 0) {
    min += plane.normal.z * this.min.z;
    max += plane.normal.z * this.max.z;
  } else {
    min += plane.normal.z * this.max.z;
    max += plane.normal.z * this.min.z;
  }

  return (min <= -plane.constant && max >= -plane.constant);
}