/// <summary>
/// Normalizes the points coordinates in the plane defined by the shell, and returns the holes and wall segments coordinates
/// in this new reference system
/// </summary>
/// <param name="s"></param>
/// <param name="segments"></param>
/// <returns></returns>
public static (List <Vertex>, GeoTransform) NormalizeShell(Shell s)
{
MWPoint3D X0 = s.Points[0];
// we choose a point p0 and make sure the origin is part of the plane of the shell
List <MWPoint3D> cPoints = s.Points.Select(p => new MWPoint3D(p.X - X0.X, p.Y - X0.Y, p.Z - X0.Z)).ToList();
List <List <MWPoint3D> > cHolesPoints = s.Holes.Select(lp => lp.Select(p => new MWPoint3D(p.X - X0.X, p.Y - X0.Y, p.Z - X0.Z)).ToList()).ToList();
List <List <MWPoint3D> > cSegPoints = s.IncludedSegments.Select(lp => lp.Select(p => new MWPoint3D(p.X - X0.X, p.Y - X0.Y, p.Z - X0.Z)).ToList()).ToList();
MWPoint3D p0 = new MWPoint3D(0, 0, 0);
// we look for 2 points such that p0, p1 and p2 are not aligned
MWPoint3D p1 = cPoints[1];
MWPoint3D p2 = cPoints[2];
for (int i = 2; i < cPoints.Count; i++)
{
p2 = cPoints[i];
double dp = Math.Abs((p2.X - p0.X) * (p1.X - p0.X) + (p2.Y - p0.Y) * (p1.Y - p0.Y) + (p2.Z - p0.Z) * (p1.Z - p0.Z));
if (dp < Points.Distance3D(p0, p1) * Points.Distance3D(p0, p2) - 1e-4)
{
break;
}
}
// we extract two normal vectors defining the plan of the shell
MWVector3D v = new MWVector3D(p1.X - p0.X, p1.Y - p0.Y, p1.Z - p0.Z);
v = v.Normalised();
MWVector3D w0 = new MWVector3D(p2.X - p0.X, p2.Y - p0.Y, p2.Z - p0.Z);
MWVector3D n = Vectors3D.VectorialProduct(v, w0);
n = n.Normalised();
MWVector3D w = Vectors3D.VectorialProduct(v, n);
w = w.Normalised();
Matrix <double> P = Matrix <double> .Build.DenseOfRowArrays(new[] { v.X, v.Y, v.Z },
new[] { w.X, w.Y, w.Z },
new[] { n.X, n.Y, n.Z });
List <MWPoint2D> newPts = cPoints.Select(p =>
{
MWVector3D vp = new MWVector3D(p.X, p.Y, p.Z);
double x = Vectors3D.ScalarProduct(vp, v);
double y = Vectors3D.ScalarProduct(vp, w);
double z = Vectors3D.ScalarProduct(vp, n);
//Console.WriteLine("z = {0} (should be 0)", z);
return(new MWPoint2D(x, y));
}).ToList();
//List<List<MWPoint2D>> newHolesPts = cHolesPoints.Select(lp => lp.Select(p =>
//{
// MWVector3D vp = new MWVector3D(p.X, p.Y, p.Z);
// double x = Vectors3D.ScalarProduct(vp, v);
// double y = Vectors3D.ScalarProduct(vp, w);
// double z = Vectors3D.ScalarProduct(vp, n);
// //Console.WriteLine("z = {0} (should be 0)", z);
// return new MWPoint2D(x, y);
//}).ToList()).ToList();
//List<List<MWPoint2D>> newSegPts = cSegPoints.Select(lp => lp.Select(p =>
//{
// MWVector3D vp = new MWVector3D(p.X, p.Y, p.Z);
// double x = Vectors3D.ScalarProduct(vp, v);
// double y = Vectors3D.ScalarProduct(vp, w);
// double z = Vectors3D.ScalarProduct(vp, n);
// //Console.WriteLine("z = {0} (should be 0)", z);
// return new MWPoint2D(x, y);
//}).ToList()).ToList();
if (newPts.Any(p => double.IsNaN(p.X)))
{
Console.WriteLine("NaN");
}
double x0 = newPts.Min(p => p.X);
double y0 = newPts.Min(p => p.Y);
double x1 = newPts.Max(p => p.X);
double y1 = newPts.Max(p => p.Y);
double l = Math.Max(x1 - x0, y1 - y0);
GeoTransform trans = new GeoTransform()
{
P = P,
X0 = X0,
Xmin = new MWPoint2D(x0, y0),
Xmax = new MWPoint2D(x1, y1)
};
return(newPts.Select(p => new Vertex((p.X - x0) / l, (p.Y - y0) / l)).ToList(),
trans
);
}
private (Mesh3, List <List <MWPoint3D> >) meshWall(Shell wall, List <List <MWPoint3D> > existingPts = null)
{
// create mesh using Triangle.NET library
Shell w = wall.Clone();
// pre addition of points on the contours
List <MWPoint3D> refinedPts = new List <MWPoint3D>();
for (int i = 0; i < w.Points.Count; i++)
{
int k = i == w.Points.Count - 1 ? 0 : i + 1;
MWPoint3D p0 = w.Points[i];
MWPoint3D p1 = w.Points[k];
MWVector3D vec = new MWVector3D(p1.X - p0.X, p1.Y - p0.Y, p1.Z - p0.Z);
vec = vec.Normalised();
double dist = Points.Distance3D(p0, p1);
int n = Convert.ToInt32(dist / 0.75) + 1;
double inc = dist / n;
refinedPts.Add(p0);
for (int j = 1; j < n; j++)
{
MWPoint3D ptAdded = new MWPoint3D(p0.X + j * vec.X * inc, p0.Y + j * vec.Y * inc, p0.Z + j * vec.Z * inc);
refinedPts.Add(ptAdded);
}
}
w.Points = refinedPts;
if (existingPts != null)
{
List <MWPoint3D> exPts = existingPts.SelectMany(l => l).ToList();
for (int i = 0; i < exPts.Count; i++)
{
for (int j = 0; j < w.Points.Count; j++)
{
int k = j == w.Points.Count - 1 ? 0 : j + 1;
if (PointIsOnLine(w.Points[j], w.Points[k], exPts[i]))
{
w.Points.Insert(k, exPts[i]);
j = 0;
}
}
}
}
Polygon pol = new Polygon();
var res = NormalizeShell(w);
var vertices = res.Item1;
pol.Add(new Contour(res.Item1));
for (int i = 0; i < vertices.Count; i++)
{
int k = i == res.Item1.Count - 1 ? 0 : i + 1;
if (Math.Sqrt(Math.Pow(vertices[i].X - vertices[k].X, 2) + Math.Pow(vertices[i].Y - vertices[k].Y, 2)) < 0.15)
{
pol.Add(new Segment(vertices[i], vertices[k]), false);
}
}
GeoTransform transform = res.Item2;
double maxL = getMaxDim(w);
double maxarea = 0.1 / maxL;
Configuration config = new Configuration();
QualityOptions qo = new QualityOptions()
{
MinimumAngle = 20,
MaximumArea = maxarea,
};
Mesh MyMesh = (new GenericMesher()).Triangulate(pol, qo) as Mesh;
List <Point3> meshPts = deNormalizeMesh(MyMesh.Vertices, wall, transform);
// extracting the contour edges for future wall and slab meshing
double xmax = MyMesh.Vertices.Max(p => p.X);
double xmin = MyMesh.Vertices.Min(p => p.X);
double ymax = MyMesh.Vertices.Max(p => p.Y);
double ymin = MyMesh.Vertices.Min(p => p.Y);
List <List <int> > edgesPtsIdx = MyMesh.Edges.Select(e =>
new List <int>()
{
MyMesh.Vertices.ToList().IndexOf(MyMesh.Vertices.Single(p => p.ID == e.P0)),
MyMesh.Vertices.ToList().IndexOf(MyMesh.Vertices.Single(p => p.ID == e.P1))
}).ToList();
List <Edge> edges = MyMesh.Edges.ToList();
List <List <MWPoint3D> > TBEdges = new List <List <MWPoint3D> >();
List <Vertex> lv = MyMesh.Vertices.ToList();
for (int i = 0; i < edges.Count; i++)
{
bool b1 = lv[edgesPtsIdx[i][0]].X == xmin && lv[edgesPtsIdx[i][1]].X == xmin;
bool b2 = lv[edgesPtsIdx[i][0]].X == xmax && lv[edgesPtsIdx[i][1]].X == xmax;
bool b3 = lv[edgesPtsIdx[i][0]].Y == ymin && lv[edgesPtsIdx[i][1]].Y == ymin;
bool b4 = lv[edgesPtsIdx[i][0]].Y == ymax && lv[edgesPtsIdx[i][1]].Y == ymax;
if (b1 || b2 || b3 || b4)
{
TBEdges.Add(new List <MWPoint3D>()
{
new MWPoint3D(meshPts[edgesPtsIdx[i][0]].X, meshPts[edgesPtsIdx[i][0]].Y, meshPts[edgesPtsIdx[i][0]].Z),
new MWPoint3D(meshPts[edgesPtsIdx[i][1]].X, meshPts[edgesPtsIdx[i][1]].Y, meshPts[edgesPtsIdx[i][1]].Z)
});
}
}
return(new Mesh3(meshPts, MyMesh.Triangles.Select(t =>
new Face3(MyMesh.Vertices.ToList().IndexOf(t.GetVertex(0)),
MyMesh.Vertices.ToList().IndexOf(t.GetVertex(1)),
MyMesh.Vertices.ToList().IndexOf(t.GetVertex(2)))).ToList()),
TBEdges);
}