code: public boolean contains(float x, float y, float z) {
          for (int i = 0; i < 6; i++) {
              if (distance(i, x, y, z) <= 0) {
                  return false;
              }
          }
          return true;
      }
docs: Checks if the frustum contains the given point.
  
  @param x The x coordinate of the point
  @param y The y coordinate of the point
  @param z The z coordinate of the point
  @return True if the frustum contains the point