public FaceList(FaceList f)
{
for (int i = 0; i < f.Count; i++)
{
Add(new Face(f[i].v0, f[i].v1, f[i].v2, f[i].normal));
}
}
public void CleanAndMerge()
{
var newVertices = new List <Vector3Float>();
var newFaces = new FaceList();
var positionToIndex = new Dictionary <(float, float, float), int>();
int GetIndex(Vector3Float position)
{
int index;
if (positionToIndex.TryGetValue((position.X, position.Y, position.Z), out index))
{
return(index);
}
var count = newVertices.Count;
positionToIndex.Add((position.X, position.Y, position.Z), count);
newVertices.Add(position);
return(count);
}
foreach (var face in Faces)
{
int iv0 = GetIndex(Vertices[face.v0]);
int iv1 = GetIndex(Vertices[face.v1]);
int iv2 = GetIndex(Vertices[face.v2]);
newFaces.Add(iv0, iv1, iv2, newVertices);
}
this.Faces = newFaces;
this.Vertices = newVertices;
}
public Mesh(List <Vector3Float> v, FaceList f)
{
Vertices.Clear();
Vertices.AddRange(v);
Faces.Clear();
Faces.AddRange(f);
}
public bool Split(Plane plane, double onPlaneDistance = .001, Func <SplitData, bool> clipFace = null, bool cleanAndMerge = true)
{
var newVertices = new List <Vector3Float>();
var newFaces = new List <Face>();
var facesToRemove = new HashSet <int>();
for (int i = 0; i < Faces.Count; i++)
{
var face = Faces[i];
if (face.Split(this.Vertices, plane, newFaces, newVertices, onPlaneDistance, clipFace))
{
// record the face for removal
facesToRemove.Add(i);
}
}
// make a new list of all the faces we are keeping
var keptFaces = new FaceList();
for (int i = 0; i < Faces.Count; i++)
{
if (!facesToRemove.Contains(i))
{
keptFaces.Add(Faces[i]);
}
}
var vertexCount = Vertices.Count;
// add the new vertices
Vertices.AddRange(newVertices);
// add the new faces (have to make the vertex indices to the new vertices
foreach (var newFace in newFaces)
{
Face faceNewIndices = newFace;
faceNewIndices.v0 += vertexCount;
faceNewIndices.v1 += vertexCount;
faceNewIndices.v2 += vertexCount;
keptFaces.Add(faceNewIndices);
}
Faces = keptFaces;
if (cleanAndMerge)
{
CleanAndMerge();
}
return(true);
}
public void MergeVertices(double treatAsSameDistance)
{
if (Vertices.Count < 2)
{
return;
}
var sameDistance = new Vector3Float(treatAsSameDistance, treatAsSameDistance, treatAsSameDistance);
var tinyDistance = new Vector3Float(.001, .001, .001);
// build a bvh tree of all the vertices
var bvhBuilder = new TradeOffBvhConstructor <int>();
var bvhTree = bvhBuilder.CreateNewHierachy(this.Vertices
.Select((v, i) => new BvhTreeItemData <int>(i, new AxisAlignedBoundingBox(v - tinyDistance, v + tinyDistance))).ToList());
var newVertices = new List <Vector3Float>(Vertices.Count);
var vertexIndexRemaping = Enumerable.Range(0, Vertices.Count).Select(i => - 1).ToList();
var searchResults = new List <int>();
// build up the list of index mapping
for (int i = 0; i < Vertices.Count; i++)
{
// first check if we have already found this vertex
if (vertexIndexRemaping[i] == -1)
{
var vertex = Vertices[i];
// remember the new index
var newIndex = newVertices.Count;
// add it to the vertices we will end up with
newVertices.Add(vertex);
// clear for new search
searchResults.Clear();
// find everything close
bvhTree.SearchBounds(new AxisAlignedBoundingBox(vertex - sameDistance, vertex + sameDistance), searchResults);
// map them to this new vertex
foreach (var result in searchResults)
{
// this vertex has not been mapped
if (vertexIndexRemaping[result] == -1)
{
vertexIndexRemaping[result] = newIndex;
}
}
}
}
// now make a new face list with the merge vertices
int GetIndex(int originalIndex)
{
return(vertexIndexRemaping[originalIndex]);
}
var newFaces = new FaceList();
foreach (var face in Faces)
{
int iv0 = GetIndex(face.v0);
int iv1 = GetIndex(face.v1);
int iv2 = GetIndex(face.v2);
if (iv0 != iv1 && iv1 != iv2 && iv2 != iv0)
{
newFaces.Add(iv0, iv1, iv2, newVertices);
}
}
this.Faces = newFaces;
this.Vertices = newVertices;
}
