private static ModelVisual3D Planar(IFeature basePath)
{
TongJi.Geometry.Polyline curve = new TongJi.Geometry.Polyline(basePath.GeoData);
if (curve.AlgebraicArea < 0)
{
curve = curve.ReversePoints();
}
var points = curve.Points.ToList();
if (points.Last() == points.First())
{
points.RemoveAt(points.Count - 1);
}
var triangles = DelaunayOfPolygon(points);
MeshBuilder mb = new MeshBuilder();
foreach (var tri in triangles)
{
var a = new Point3D(tri.A.x, tri.A.y, 0);
var b = new Point3D(tri.B.x, tri.B.y, 0);
var c = new Point3D(tri.C.x, tri.C.y, 0);
mb.AddTriangle(a, b, c);
}
ModelVisual3D visual = new ModelVisual3D();
visual.Content = new GeometryModel3D(mb.ToMesh(), MaterialHelper.CreateMaterial(Colors.Blue));
return(visual);
}
public static MeshBuilder Planar(TongJi.Geometry.Polyline curve)
{
const double epsilon = 0.001;
curve.ReducePoints(epsilon);
var points = curve.Points.ToList();
if (points.Last().DistTo(points.First()) < epsilon)
{
points.RemoveAt(points.Count - 1);
}
var triIndices = CuttingEarsTriangulator.Triangulate(points.Select(p => new System.Windows.Point(p.x, p.y)).ToList());
if (triIndices == null)
{
return(null);
}
MeshBuilder mb = new MeshBuilder();
for (int i = 0; i < triIndices.Count; i += 3)
{
var a = new Point3D(points[triIndices[i]].x, points[triIndices[i]].y, 0);
var b = new Point3D(points[triIndices[i + 1]].x, points[triIndices[i + 1]].y, 0);
var c = new Point3D(points[triIndices[i + 2]].x, points[triIndices[i + 2]].y, 0);
mb.AddTriangle(a, b, c);
}
return(mb);
}
public static MeshBuilder Planar(TongJi.Geometry.Polyline curve)
{
if (curve.AlgebraicArea < 0)
{
curve = curve.ReversePoints();
}
var points = curve.Points.ToList();
if (points.Last() == points.First())
{
points.RemoveAt(points.Count - 1);
}
var triangles = DelaunayOfPointSet(points);
//var vertices = new FarseerPhysics.Common.Vertices(curve.Points.Select(p => new Microsoft.Xna.Framework.Vector2((float)p.x, (float)p.y)).ToArray());
//var triangles = FarseerPhysics.Common.Decomposition.EarclipDecomposer.TriangulatePolygon(vertices);
//var vertices = new TongJi.Geometry.Computational.Vertices(curve.Points.Select(p => new TongJi.Geometry.Computational.Vector2((float)p.x, (float)p.y)));
//var decomp = new TongJi.Geometry.Computational.Decompose();
//var triangles = decomp.Run(vertices);
//int index0 = 0;
//var points = curve.Points.Select(p => new Point3D((float)p.x, (float)p.y, 0)).ToList();
//int pointCount = curve.Count;
MeshBuilder mb = new MeshBuilder();
//points.ForEach(p => mb.Vertices.Add(p));
//Vector3D normal = Vector3D.Zero;
//if (pointCount > 2)
//{
// normal = (points[1] - points[0]).Cross(points[2] - points[0]).Normalize();
//}
//points.ForEach(p => mb.Normals.Add(normal));
//mb.MakePlanarFaces(index0, pointCount);
foreach (var tri in triangles)
{
var a = tri.A.ToPoint3D();
var b = tri.B.ToPoint3D();
var c = tri.C.ToPoint3D();
mb.AddTriangle(a, b, c);
//if ((b - a).Cross(c - a).z > 0)
//{
// mb.AddTriangle(a, b, c);
//}
//else
//{
// mb.AddTriangle(a, c, b);
//}
}
return(mb);
}
public static MeshBuilder ExtrudeSmooth(TongJi.Geometry.Polyline curve, double height)
{
var points0 = curve.Points.Select(p => new Point3D(p.x, p.y, 0)).ToList();
var points1 = curve.Points.Select(p => new Point3D(p.x, p.y, height)).ToList();
int pointCount = curve.Count;
Point3D[,] points = new Point3D[pointCount, 2];
Enumerable.Range(0, pointCount).ToList().ForEach(i => points[i, 0] = points0[i]);
Enumerable.Range(0, pointCount).ToList().ForEach(i => points[i, 1] = points1[i]);
return(MeshBuilder.RectGrid(points));
}
public static MeshBuilder ExtrudeWithCaps(TongJi.Geometry.Polyline curve, double height)
{
MeshBuilder mb = MeshBuilder.Extrude(curve, height);
MeshBuilder cap0 = MeshBuilder.Planar(curve); // mod 20120727
MeshBuilder cap1 = MeshBuilder.Planar(curve);
Matrix4 translation = Matrix4.Translation(0, 0, height);
cap1.Transform(translation);
mb.Append(cap0);
mb.Append(cap1);
return(mb);
}
public static MeshBuilder Extrude(TongJi.Geometry.Polyline curve, double height)
{
var points0 = curve.Points.Select(p => new Point3D(p.x, p.y, 0)).ToList();
var points1 = curve.Points.Select(p => new Point3D(p.x, p.y, height)).ToList();
int pointCount = curve.Count;
MeshBuilder mb = new MeshBuilder();
for (int i = 0; i < pointCount - 1; i++)
{
mb.AddQuad(points0[i], points1[i], points1[i + 1], points0[i + 1]);
}
return(mb);
}
public static MeshBuilder ExtrudeWithCaps(TongJi.Geometry.Polyline curve, double height)
{
MeshBuilder mb = MeshBuilder.Extrude(curve, height);
MeshBuilder cap0 = MeshBuilder.Planar(curve);
MeshBuilder cap1 = MeshBuilder.Planar(curve);
if (cap0 != null)
{
cap0.FlipFaces();
cap1.Transform(Matrix4.Translation(0, 0, height));
mb.Append(cap0);
mb.Append(cap1);
}
return(mb);
}
