/// <summary>
/// Destroys a face and removes it from the global face list. All edges of
/// fZap will have a NULL pointer as their left face. Any edges which
/// also have a NULL pointer as their right face are deleted entirely
/// (along with any isolated vertices this produces).
/// An entire mesh can be deleted by zapping its faces, one at a time,
/// in any order. Zapped faces cannot be used in further mesh operations!
/// </summary>
public void ZapFace(IPool pool, MeshUtils.Face fZap)
{
var eStart = fZap._anEdge;
// walk around face, deleting edges whose right face is also NULL
var eNext = eStart._Lnext;
MeshUtils.Edge e, eSym;
do
{
e = eNext;
eNext = e._Lnext;
e._Lface = null;
if (e._Rface == null)
{
// delete the edge -- see TESSmeshDelete above
if (e._Onext == e)
{
MeshUtils.KillVertex(pool, e._Org, null);
}
else
{
// Make sure that e._Org points to a valid half-edge
e._Org._anEdge = e._Onext;
MeshUtils.Splice(e, e._Oprev);
}
eSym = e._Sym;
if (eSym._Onext == eSym)
{
MeshUtils.KillVertex(pool, eSym._Org, null);
}
else
{
// Make sure that eSym._Org points to a valid half-edge
eSym._Org._anEdge = eSym._Onext;
MeshUtils.Splice(eSym, eSym._Oprev);
}
MeshUtils.KillEdge(pool, e);
}
} while (e != eStart);
/* delete from circular doubly-linked list */
var fPrev = fZap._prev;
var fNext = fZap._next;
fNext._prev = fPrev;
fPrev._next = fNext;
pool.Return(fZap);
}
public void Reset(IPool pool)
{
for (MeshUtils.Face f = _fHead, fNext = _fHead; f._next != null; f = fNext)
{
fNext = f._next;
pool.Return(f);
}
for (MeshUtils.Vertex v = _vHead, vNext = _vHead; v._next != null; v = vNext)
{
vNext = v._next;
pool.Return(v);
}
for (MeshUtils.Edge e = _eHead, eNext = _eHead; e._next != null; e = eNext)
{
eNext = e._next;
pool.Return(e._Sym);
pool.Return(e);
}
_vHead = null;
_fHead = null;
_eHead = _eHeadSym = null;
}
public void Init(IPool pool)
{
var v = _vHead = pool.Get <MeshUtils.Vertex>();
var f = _fHead = pool.Get <MeshUtils.Face>();
var pair = MeshUtils.EdgePair.Create(pool);
var e = _eHead = pair._e;
var eSym = _eHeadSym = pair._eSym;
v._next = v._prev = v;
v._anEdge = null;
f._next = f._prev = f;
f._anEdge = null;
f._trail = null;
f._marked = false;
f._inside = false;
e._next = e;
e._Sym = eSym;
e._Onext = null;
e._Lnext = null;
e._Org = null;
e._Lface = null;
e._winding = 0;
e._activeRegion = null;
eSym._next = eSym;
eSym._Sym = e;
eSym._Onext = null;
eSym._Lnext = null;
eSym._Org = null;
eSym._Lface = null;
eSym._winding = 0;
eSym._activeRegion = null;
}
