public static List <g3.PolyLine3d> ConvertMeshToPolylines(Rhino.Geometry.Mesh mesh)
{
var result = new List <g3.PolyLine3d>();
if (mesh.Ngons.Count == 0)
{
mesh.Ngons.AddPlanarNgons(Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance);
}
foreach (var n in mesh.Ngons)
{
var b = n.BoundaryVertexIndexList();
var pL = new g3.PolyLine3d();
foreach (var v in b)
{
var temp = mesh.Vertices[(int)v];
pL.AppendVertex(new Vector3d(temp.X, temp.Y, temp.Z));
}
}
return(result);
}
//public static void VoronoiMesh(List<g3.PolyLine3d> mesh, out List<g3.Line3d> listLines, out List<g3.PolyLine3d> listPolylines)
//{
// System.Collections.Generic.SortedDictionary<int, MeshNode> faces = new System.Collections.Generic.SortedDictionary<int, MeshNode>();
// int index = 0;
// foreach (var meshFaceIndex in mesh.TriangleIndices())
// {
// var frame = mesh.GetTriFrame(meshFaceIndex);
// g3.Index3i neighbors = mesh.GetTriNeighbourTris(meshFaceIndex);
// g3.Index3i vertex_index = mesh.GetTriangle(meshFaceIndex);
// faces.Add(meshFaceIndex, new MeshNode(index++, meshFaceIndex, frame, neighbors, vertex_index));
// }
// foreach (var f in faces)
// {
// f.Value.neighbors.Clear();
// f.Value.neighbors.Capacity = 3;
// for (int i = 0; i < 3; ++i)
// {
// int fn = f.Value.neighbors_index[i];
// if (fn >= 0)
// f.Value.neighbors.Add(faces[fn]);
// }
// if (f.Value.neighbors.Count < 3)
// {
// f.Value.locked = true;
// foreach (var n in f.Value.neighbors)
// n.locked = true;
// }
// }
// outputMesh = new g3.DMesh3(g3.MeshComponents.None);
// listLines = new List<g3.Line3d>();
// listPolylines = new List<g3.PolyLine3d>();
// foreach (var f in faces)
// {
// outputMesh.AppendVertex(f.Value.frame.Origin);
// }
// HashSet<int> processedPoints = new HashSet<int>();
// foreach (var f in faces)
// {
// for (int i = 0; i < 3; i++)
// {
// List<int> outputLine = new List<int>();
// if (processedPoints.Contains(f.Value.vertex_index[i]))
// continue;
// int checkVertex = f.Value.vertex_index[i];
// MeshNode currentFaces = f.Value;
// MeshNode prevFace = null;
// bool fullLoop = false;
// while (true)
// {
// for (int j = 0; j < currentFaces.neighbors.Count; j++)
// {
// var neighbor = currentFaces.neighbors[j];
// if (neighbor.UsesVertex(checkVertex))
// {
// if (neighbor == prevFace)
// continue;
// if (neighbor == f.Value)
// {
// fullLoop = true;
// break; // Found full loop
// }
// outputLine.Add(neighbor.index);
// prevFace = currentFaces;
// currentFaces = neighbor;
// j = -1;
// }
// }
// break;
// }
// if (fullLoop)
// {
// processedPoints.Add(checkVertex);
// var polyline = new g3.PolyLine3d();
// if (outputLine.Count > 2)
// {
// g3.Vector3d centerPoint = f.Value.frame.Origin;
// foreach (var p in outputLine)
// centerPoint += outputMesh.GetVertex(p);
// centerPoint /= (outputLine.Count + 1);
// int center = outputMesh.AppendVertex(centerPoint);
// var pS = outputMesh.GetVertex(f.Value.index);
// var p0 = outputMesh.GetVertex(outputLine[0]);
// var pE = outputMesh.GetVertex(outputLine[outputLine.Count - 1]);
// var normal = mesh.GetTriNormal(f.Value.meshIndex);
// polyline.AppendVertex(pS);
// polyline.AppendVertex(p0);
// listLines.Add(new g3.Line3d(pS, p0 - pS));
// var n = MathUtil.Normal(centerPoint, pS, p0);
// bool reverseTri = n.Dot(normal) < 0;
// if (!reverseTri)
// outputMesh.AppendTriangle(center, f.Value.index, outputLine[0]);
// else
// outputMesh.AppendTriangle(center, outputLine[0], f.Value.index);
// for (int j = 0; j < outputLine.Count - 1; j++)
// {
// var p1 = outputMesh.GetVertex(outputLine[j]);
// var p2 = outputMesh.GetVertex(outputLine[j + 1]);
// listLines.Add(new g3.Line3d(p1, p2 - p1));
// polyline.AppendVertex(p2);
// if (!reverseTri)
// outputMesh.AppendTriangle(center, outputLine[j], outputLine[j + 1]);
// else
// outputMesh.AppendTriangle(center, outputLine[j + 1], outputLine[j]);
// }
// polyline.AppendVertex(pS);
// listLines.Add(new g3.Line3d(pE, pS - pE));
// listPolylines.Add(polyline);
// if (!reverseTri)
// outputMesh.AppendTriangle(center, outputLine[outputLine.Count - 1], f.Value.index);
// else
// outputMesh.AppendTriangle(center, f.Value.index, outputLine[outputLine.Count - 1]);
// }
// }
// }
// }
//}
public static void VoronoiMesh(g3.DMesh3 mesh, out g3.DMesh3 outputMesh, out List <g3.Line3d> listLines, out List <g3.PolyLine3d> listPolylines)
{
System.Collections.Generic.SortedDictionary <int, MeshNode> faces = new System.Collections.Generic.SortedDictionary <int, MeshNode>();
int index = 0;
foreach (var meshFaceIndex in mesh.TriangleIndices())
{
var frame = mesh.GetTriFrame(meshFaceIndex);
g3.Index3i neighbors = mesh.GetTriNeighbourTris(meshFaceIndex);
g3.Index3i vertex_index = mesh.GetTriangle(meshFaceIndex);
faces.Add(meshFaceIndex, new MeshNode(index++, meshFaceIndex, frame, neighbors, vertex_index));
}
foreach (var f in faces)
{
f.Value.neighbors.Clear();
f.Value.neighbors.Capacity = 3;
for (int i = 0; i < 3; ++i)
{
int fn = f.Value.neighbors_index[i];
if (fn >= 0)
{
f.Value.neighbors.Add(faces[fn]);
}
}
if (f.Value.neighbors.Count < 3)
{
f.Value.locked = true;
foreach (var n in f.Value.neighbors)
{
n.locked = true;
}
}
}
outputMesh = new g3.DMesh3(g3.MeshComponents.None);
listLines = new List <g3.Line3d>();
listPolylines = new List <g3.PolyLine3d>();
foreach (var f in faces)
{
outputMesh.AppendVertex(f.Value.frame.Origin);
}
HashSet <int> processedPoints = new HashSet <int>();
foreach (var f in faces)
{
for (int i = 0; i < 3; i++)
{
List <int> outputLine = new List <int>();
if (processedPoints.Contains(f.Value.vertex_index[i]))
{
continue;
}
int checkVertex = f.Value.vertex_index[i];
MeshNode currentFaces = f.Value;
MeshNode prevFace = null;
bool fullLoop = false;
while (true)
{
for (int j = 0; j < currentFaces.neighbors.Count; j++)
{
var neighbor = currentFaces.neighbors[j];
if (neighbor.UsesVertex(checkVertex))
{
if (neighbor == prevFace)
{
continue;
}
if (neighbor == f.Value)
{
fullLoop = true;
break; // Found full loop
}
outputLine.Add(neighbor.index);
prevFace = currentFaces;
currentFaces = neighbor;
j = -1;
}
}
break;
}
if (fullLoop)
{
processedPoints.Add(checkVertex);
var polyline = new g3.PolyLine3d();
if (outputLine.Count > 2)
{
g3.Vector3d centerPoint = f.Value.frame.Origin;
foreach (var p in outputLine)
{
centerPoint += outputMesh.GetVertex(p);
}
centerPoint /= (outputLine.Count + 1);
int center = outputMesh.AppendVertex(centerPoint);
var pS = outputMesh.GetVertex(f.Value.index);
var p0 = outputMesh.GetVertex(outputLine[0]);
var pE = outputMesh.GetVertex(outputLine[outputLine.Count - 1]);
var normal = mesh.GetTriNormal(f.Value.meshIndex);
polyline.AppendVertex(pS);
polyline.AppendVertex(p0);
listLines.Add(new g3.Line3d(pS, p0 - pS));
var n = MathUtil.Normal(centerPoint, pS, p0);
bool reverseTri = n.Dot(normal) < 0;
if (!reverseTri)
{
outputMesh.AppendTriangle(center, f.Value.index, outputLine[0]);
}
else
{
outputMesh.AppendTriangle(center, outputLine[0], f.Value.index);
}
for (int j = 0; j < outputLine.Count - 1; j++)
{
var p1 = outputMesh.GetVertex(outputLine[j]);
var p2 = outputMesh.GetVertex(outputLine[j + 1]);
listLines.Add(new g3.Line3d(p1, p2 - p1));
polyline.AppendVertex(p2);
if (!reverseTri)
{
outputMesh.AppendTriangle(center, outputLine[j], outputLine[j + 1]);
}
else
{
outputMesh.AppendTriangle(center, outputLine[j + 1], outputLine[j]);
}
}
polyline.AppendVertex(pS);
listLines.Add(new g3.Line3d(pE, pS - pE));
listPolylines.Add(polyline);
if (!reverseTri)
{
outputMesh.AppendTriangle(center, outputLine[outputLine.Count - 1], f.Value.index);
}
else
{
outputMesh.AppendTriangle(center, f.Value.index, outputLine[outputLine.Count - 1]);
}
}
}
}
}
}