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+"]");
  }
}