public override List <Triangle3d> build()
{
/* First find a hull edge -- just connect bottommost to second from bottom */
Point3d bot, bot2; /* bottom point and adjacent point*/
bot = this.Bottom();
bot2 = search2d(bot);
/* intialize the edge stack */
EdgeStack es = new EdgeStack();
es.put(bot, bot2);
es.put(bot2, bot);
List <Triangle3d> faces = new List <Triangle3d>(20);
Edge3d e = new Edge3d(bot, bot2);
//faces.addElement(e);
/* now the main loop -- keep finding faces till there are no more to be found */
while (!es.isEmpty())
{
e = es.get();
Point3d cand = search(e);
faces.Add(new Triangle3d(e.start, e.end, cand));
es.putp(e.start, cand);
es.putp(cand, e.end);
}
return(faces);
}
public override List <Triangle3d> build()
{
EdgeStack es = new EdgeStack();
List <Triangle3d> faces = new List <Triangle3d>();
if (pts.Length < 2)
{
return(faces);
}
faces.Add(new Triangle3d(pts[0], pts[1], pts[2]));
faces.Add(new Triangle3d(pts[0], pts[2], pts[1]));
/* now the main loop -- add vertices one at a time */
for (int i = 3; i < pts.Length; i++)
{
/* delete faces that this vertex can see*/
bool inside = true; //are we inside the hull?
for (int j = 0; j < faces.Count; j++)
{
Triangle3d t = faces[j];
if (t.inside(pts[i]))
{
inside = false;
/* update boundary of hole */
es.putp(t.tri[0], t.tri[1]);
es.putp(t.tri[1], t.tri[2]);
es.putp(t.tri[2], t.tri[0]);
}
}
if (inside)
{
continue;
}
while (!es.isEmpty())
{
Edge3d e = es.get();
faces.Add(new Triangle3d(e.start, e.end, pts[i]));
}
}
return(faces);
}
public override List <Triangle3d> build()
{
Triangle3d face1, face2; //first two faces created
EdgeStack es = new EdgeStack(); //used to find boundary of hole
List <Triangle3d> faces = new List <Triangle3d>();
this.findmaxmin();
//make p[3] the furthest from p[0]p[1]
HalfSpace h = new HalfSpace(pts[0], pts[1]);
for (int i = 3; i < pts.Length; i++)
{
if (h.normal.dot(pts[i]) > h.normal.dot(pts[2]))
{
Point3d temp = pts[2];
pts[2] = pts[i];
pts[i] = temp;
}
}
face1 = new Triangle3d(pts[0], pts[1], pts[2]);
face2 = new Triangle3d(pts[0], pts[2], pts[1]);
faces.Add(face1);
faces.Add(face2);
/* associate remaining points with one of these two faces */
for (int i = 3; i < pts.Length; i++)
{
if (!face1.add(pts[i]))
{
face2.add(pts[i]);
}
}
for (int i = 0; i < faces.Count; i++)
{
List <Point3d> ps = new List <Point3d>();
Triangle3d selected = faces[i];
Point3d newp = selected.extreme();
if (newp == null)
{
continue;
}
for (int j = 0; j < faces.Count; j++)
{
Triangle3d t = faces[j];
if (t.inside(newp))
{
es.putp(t.tri[0], t.tri[1]);
es.putp(t.tri[1], t.tri[2]);
es.putp(t.tri[2], t.tri[0]);
/*add the points associated with this face to ps */
ps.AddRange(t.pts);
}
}
while (!es.isEmpty())
{
Edge3d e = es.get();
Triangle3d t = new Triangle3d(e.start, e.end, newp);
List <Point3d> ps2 = new List <Point3d>(ps.Count);
for (int j = ps.Count - 1; j >= 0; j--)
{
Point3d p = ps[j];
if ((!p.Equals(newp)) && !t.add(p))
{
ps2.Add(p);
}
}
ps = ps2;
faces.Add(t);
}
}
return(faces);
}
