public Polygon3D Vs_polygon_clip_3df(Polygon3D poly)
{
Polygon3D s = new Polygon3D();
Polygon3D r = new Polygon3D();
s.SetPol(poly);
double zmin = s.ZMin();
double zmax = s.ZMax();
if (zmax < 0.10000000000000001D)
{
return(r);
}
if (zmin >= 0.10000000000000001D)
{
r.SetPol(poly);
return(r);
}
for (int i = 0; i < s.NVertex(); i++)
{
int j;
if (i == s.NVertex() - 1)
{
j = 0;
}
else
{
j = i + 1;
}
double xi = s.GetVertex(i).x;
double yi = s.GetVertex(i).y;
double zi = s.GetVertex(i).z;
double xj = s.GetVertex(j).x;
double yj = s.GetVertex(j).y;
double zj = s.GetVertex(j).z;
if (zi >= 0.10000000000000001D)
{
r.AddVertex(new Vector3D(xi, yi, zi));
if (zj < 0.10000000000000001D)
{
double t = (0.10000000000000001D - zi) / (zj - zi);
r.AddVertex(new Vector3D(xi + (xj - xi) * t, yi + (yj - yi) * t, 0.10000000000000001D));
}
}
else if (zj >= 0.10000000000000001D)
{
double t_0 = (0.10000000000000001D - zi) / (zj - zi);
r.AddVertex(new Vector3D(xi + (xj - xi) * t_0, yi + (yj - yi) * t_0, 0.10000000000000001D));
}
}
return(r);
}