public class Point3D {
  public float x, y, z;           // coordinate of vertex

  public Point3D() {
  }

  public Point3D(float xval, float yval, float zval) {
        x = xval;
        y = yval;
        z = zval;
  }

  public String toString() {
        return new String(" ["+x+", "+y+", "+z+"]");
  }
}