public static IEnumerable <Poly> GetTriangles(this IEnumerable <IPoint> points)
{
var delauney = new Delaunator(points.ToArray());
var triangles = delauney.GetTriangles();
return(triangles.Select(tri => new Poly()
{
Points = tri.Points.ToPointCollection(),
Index = tri.Index
}));
}
/// <summary>
/// Makes the actual mesh
/// </summary>
protected void _redraw()
{
if (lines.Count > 0)
{
Polygon = new List <DCurve3>();
foreach (Dataline ring in lines)
{
foreach (VertexLookup v in ring.VertexTable)
{
VertexTable.Add(v);
}
DCurve3 curve = new DCurve3();
curve.Vector3(ring.GetVertexPositions(), true);
Polygon.Add(curve);
}
}
MeshFilter mf = Shape.GetComponent <MeshFilter>();
MeshCollider[] mc = Shape.GetComponents <MeshCollider>();
mf.mesh = null;
Mesh mesh = new Mesh();
Mesh imesh = new Mesh();
mesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
imesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
Frame3f frame = new Frame3f();
Vector3[] vertices;
GeneralPolygon2d polygon2d;
Delaunator delaunator;
List <int> triangles = new List <int>();
try {
//
// Map 3d Polygon to the bext fit 2d polygon and also return the frame used for the mapping
//
polygon2d = Polygon.ToPolygon(ref frame);
//
// calculate the dalaunay triangulation of the 2d polygon
//
delaunator = new Delaunator(polygon2d.AllVerticesItr().ToPoints());
IEnumerable <Vector2d> vlist = delaunator.Points.ToVectors2d();
vertices = new Vector3[vlist.Count()];
//
// for each vertex in the dalaunay triangulatin - map back to a 3d point and also populate the vertex table
//
for (int i = 0; i < vlist.Count(); i++)
{
Vector2d v = vlist.ElementAt(i);
try {
Vector3d v1 = Polygon.AllVertexItr().Find(item => v.Distance(frame.ToPlaneUV((Vector3f)item, 2)) < 0.001);
vertices[i] = Shape.transform.InverseTransformPoint((Vector3)v1);
VertexLookup vl = VertexTable.Find(item => v1.Distance(item.Com.transform.position) < 0.001);
if (vl != null)
{
vl.pVertex = i;
}
} catch {
Debug.Log("Mesh Error");
}
}
//
// eaxtract the triangles from the delaunay triangulation
//
IEnumerable <ITriangle> tris = delaunator.GetTriangles();
for (int i = 0; i < tris.Count(); i++)
{
ITriangle tri = tris.ElementAt(i);
if (polygon2d.Contains(tri.CetIncenter()))
{
int index = 3 * i;
triangles.Add(delaunator.Triangles[index]);
triangles.Add(delaunator.Triangles[index + 1]);
triangles.Add(delaunator.Triangles[index + 2]);
}
}
} catch (Exception e) {
throw new Exception("feature is not a valid Polygon : " + e.ToString());
}
//
// build the mesh entity
//
mesh.vertices = vertices;
mesh.triangles = triangles.ToArray();
mesh.uv = BuildUVs(vertices);
mesh.RecalculateBounds();
mesh.RecalculateNormals();
imesh.vertices = mesh.vertices;
imesh.triangles = triangles.Reverse <int>().ToArray();
imesh.uv = mesh.uv;
imesh.RecalculateBounds();
imesh.RecalculateNormals();
mf.mesh = mesh;
try {
mc[0].sharedMesh = mesh;
mc[1].sharedMesh = imesh;
} catch (Exception e) {
Debug.Log(e.ToString());
}
}
