code: public void setVertex(int i, double x, double y, double z) {
          this.cornerX.set(i, x);
          this.cornerY.set(i, y);
          this.cornerZ.set(i, z);
          calcG();
      }
docs: Sets the coordinates of the corner.
  
  @param i The index number of the 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.