class MyFace{
  MyPoint[] points = new MyPoint[0]; //array of points
  MyFace(){
  }
  MyFace(MyPoint[] inp){ //construct a face out of points
    points = new MyPoint[inp.length];
    for(int i=0; i<points.length; i++)
      points[i] = new MyPoint(inp[i].x, inp[i].y, inp[i].z);
  }
  //add a point to a face one at a time
  void addPoint(float addX, float addY, float addZ){
    points = (MyPoint[])append(points, new MyPoint(addX,addY,addZ));
  }
  void plot(){
    if(points.length==4) //if we have four point faces
      beginShape(QUADS); //use the QUADS setup
    else
      beginShape(POLYGON); //else POLYGONS
    for(int i=0; i<points.length; i++)
      vertex(points[i].x,points[i].y,points[i].z);
    endShape(CLOSE); //close the face
  }
}