/** @return */
public double getFaceArea() {
if (_halfedge == null) {
return 0;
}
final WB_Coord n = getFaceNormal();
if (WB_Vector.getLength3D(n) < 0.5) {
return 0;
}
final double x = WB_Math.fastAbs(n.xd());
final double y = WB_Math.fastAbs(n.yd());
final double z = WB_Math.fastAbs(n.zd());
double area = 0;
int coord = 3;
if ((x >= y) && (x >= z)) {
coord = 1;
} else if ((y >= x) && (y >= z)) {
coord = 2;
}
HE_Halfedge he = _halfedge;
do {
switch (coord) {
case 1:
area +=
(he.getVertex().yd()
* (he.getNextInFace().getVertex().zd() - he.getPrevInFace().getVertex().zd()));
break;
case 2:
area +=
(he.getVertex().xd()
* (he.getNextInFace().getVertex().zd() - he.getPrevInFace().getVertex().zd()));
break;
case 3:
area +=
(he.getVertex().xd()
* (he.getNextInFace().getVertex().yd() - he.getPrevInFace().getVertex().yd()));
break;
}
he = he.getNextInFace();
} while (he != _halfedge);
switch (coord) {
case 1:
area *= (0.5 / x);
break;
case 2:
area *= (0.5 / y);
break;
case 3:
area *= (0.5 / z);
}
return WB_Math.fastAbs(area);
}
/** @return */
public boolean isDegenerate() {
return WB_Vector.getLength3D(getFaceNormal()) < 0.5;
}