private static Mesh CreateHullMesh(Mesh mesh, VertexCollecton sourceVertices)
{
// Get the convex hull for the mesh
var cHVertexList = new List <CHVertex>();
foreach (var vertex in sourceVertices)
{
cHVertexList.Add(new CHVertex(vertex.Position));
}
var convexHull = ConvexHull <CHVertex, CHFace> .Create(cHVertexList, .01);
if (convexHull != null)
{
// create the mesh from the hull data
Mesh hullMesh = new Mesh();
foreach (var face in convexHull.Faces)
{
List <IVertex> vertices = new List <IVertex>();
foreach (var vertex in face.Vertices)
{
var meshVertex = hullMesh.CreateVertex(new Vector3(vertex.Position[0], vertex.Position[1], vertex.Position[2]));
vertices.Add(meshVertex);
}
hullMesh.CreateFace(vertices.ToArray());
}
try
{
// make sure there is not currently a convex hull on this object
if (mesh.PropertyBag.ContainsKey(ConvexHullMesh))
{
mesh.PropertyBag.Remove(ConvexHullMesh);
}
// add the new hull
mesh.PropertyBag.Add(ConvexHullMesh, hullMesh);
// make sure we remove this hull if the mesh changes
mesh.Changed += MeshChanged_RemoveConvexHull;
// remove the marker that says we are building the hull
if (mesh.PropertyBag.ContainsKey(CreatingConvexHullMesh))
{
mesh.PropertyBag.Remove(CreatingConvexHullMesh);
}
return(hullMesh);
}
catch
{
}
}
return(null);
}
private void RemoveVerticesMarkedForDeletion(HashSet <Vertex> markedForDeletion)
{
VertexCollecton NonDeleteVertices = new VertexCollecton();
for (int i = 0; i < Vertices.Count; i++)
{
Vertex vertexToCheck = Vertices[i];
if (!markedForDeletion.Contains(vertexToCheck))
{
NonDeleteVertices.Add(vertexToCheck, SortOption.WillSortLater);
}
}
// we put them in in the same order they were in, so we keep the state
NonDeleteVertices.IsSorted = vertices.IsSorted;
vertices = NonDeleteVertices;
}
private void RemoveVerticesMarkedForDeletion(HashSet<Vertex> markedForDeletion)
{
VertexCollecton NonDeleteVertices = new VertexCollecton();
for (int i = 0; i < Vertices.Count; i++)
{
Vertex vertexToCheck = Vertices[i];
if (!markedForDeletion.Contains(vertexToCheck))
{
NonDeleteVertices.Add(vertexToCheck, SortOption.WillSortLater);
}
}
// we put them in in the same order they were in, so we keep the state
NonDeleteVertices.IsSorted = vertices.IsSorted;
vertices = NonDeleteVertices;
}