public static void Load(string filepath, TriangleMesh triMesh, float scale)
{
using (System.IO.TextReader reader = File.OpenText(filepath))
{
XmlSerializer ser = new XmlSerializer(typeof(Collada));
Collada c = (Collada)ser.Deserialize(reader);
foreach (Geometry g in c.library_geometries)
{
float[] floats = g.mesh.PositionFloats();
int[] indices = g.mesh.TrianglePositionIndices();
List<Vector3> vertices = new List<Vector3>();
for (int i = 0; i < floats.Count(); i += 3)
{
Vector3 v = new Vector3(floats[i], floats[i + 1], floats[i + 2]);
vertices.Add(v * scale);
}
for (int i = 0; i < indices.Count(); i += 3)
{
triMesh.AddTriangle(vertices[indices[i]], vertices[indices[i + 1]], vertices[indices[i + 2]]);
}
}
}
triMesh.Clean();
}
public AnalyzedTriangleMesh(TriangleMesh mesh)
{
foreach (Triangle t in mesh.Triangles)
{
this.AddTriangle(t);
}
}
public Slice(TriangleMesh mesh, Plane plane)
{
//GL.Disable(EnableCap.Lighting);
//GL.LineWidth(2);
//GL.Begin(PrimitiveType.Lines);
//float height = 0;
// Slice at 3 levels and combine all segments - this obviates dealing with triangles that are exactly on the plane.
for (int i = -1; i <= 1; i++)
{
Vector3 offset = plane.Normal * 0.0001f * (float)i;
LineHandler lineHandler = new LineHandler(0.0f);
Plane testPlane = new Plane(plane.Normal, plane.Point + offset);
foreach (Triangle t in mesh.Triangles)
{
var intersect = new TrianglePlaneIntersect(t, testPlane);
if (intersect.Intersects)
{
lineHandler.AddSegment(intersect.PointA, intersect.PointB);
//GL.Color3(Color.Blue);
//GL.Vertex3(intersect.PointA + new Vector3(0, 0, height + .01f));
//GL.Color3(Color.Red);
//GL.Vertex3(intersect.PointB + new Vector3(0, 0, height + .01f));
}
else if (intersect.all_intersect && Vector3.Dot(t.Plane.Normal, testPlane.Normal) > 0.5f)
{
// Entire triangle intersects
// Add all the triangle edges (TODO: clean this up...)
List<Vector3> vertices = new List<Vector3>(t.Vertices);
for (int a = 0; a < 3; a++)
{
Vector3 v1 = vertices[a];
Vector3 v2 = vertices[(a + 1) % 3];
lineHandler.AddSegment(v1, v2);
}
}
}
if (this.polyTree == null)
{
Init(lineHandler.GetOuterLoops(), plane);
}
else
{
Slice s = new Slice(lineHandler.GetOuterLoops(), plane);
this.Union(s);
}
}
//GL.End();
//GL.Enable(EnableCap.Lighting);
//GL.LineWidth(1);
}
public static void Load(string filepath, TriangleMesh triMesh, float scale)
{
STLDocument stl = null;
using (Stream filestream = File.OpenRead(filepath))
{
stl = STLDocument.Read(filestream);
}
foreach (var facet in stl.Facets)
{
List <Vector3> vertices = new List <Vector3>();
foreach (var vertex in facet.Vertices)
{
Vector3 v = new Vector3((float)vertex.X, (float)vertex.Y, (float)vertex.Z);
vertices.Add(v * scale);
}
triMesh.AddTriangle(new Triangle(vertices[0], vertices[1], vertices[2]));
}
triMesh.Clean();
}
/// <summary>
/// Split a mesh into meshes of connected triangles
/// </summary>
/// <returns></returns>
public List <TriangleMesh> SplitDisconnected()
{
List <TriangleMesh> meshes = new List <TriangleMesh>();
List <TriangleIndices> tempTriangles = new List <TriangleIndices>();
tempTriangles = triangles.ToList();
while (tempTriangles.Count > 0)
{
var mesh = new TriangleMesh();
var first = tempTriangles[0];
var connected = GetConnected(ref tempTriangles, first);
foreach (var indices in connected)
{
mesh.AddTriangle(new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]));
}
meshes.Add(mesh);
}
return(meshes);
}
public Edge(TriangleMesh parent)
{
this.parentMesh = parent;
}
public static void Load(string filepath, TriangleMesh triMesh, float scale)
{
List<Vector3> vertices = new List<Vector3>();
string[] strings = System.IO.File.ReadAllLines(filepath);
// Lines starting with v are a vertex:
// "v 10.2426 4.5e-013 -31.7638"
Regex vertexRegex = new Regex(@"^v\s+(?<x>\S+)\s+(?<y>\S+)\s+(?<z>\S+)", RegexOptions.IgnoreCase);
// Lines starting with f are a face. The indices are <vertex>/<texture>/<normal>, where texture and normal are optional.
// "f 1/1/1 2/2/1 3/3/1 4/4/1 5/5/1"
Regex faceRegex = new Regex(@"^f(?<face_data>\s+(?<vertex>\d+)/?(?<texture_coordinate>\d+)?/?(?<vertex_normal>\d+)?)+", RegexOptions.IgnoreCase);
foreach (string s in strings)
{
if (vertexRegex.IsMatch(s))
{
Match m = vertexRegex.Match(s);
float x = float.Parse(m.Groups["x"].Value);
float y = float.Parse(m.Groups["y"].Value);
float z = float.Parse(m.Groups["z"].Value);
// Rotate 90 degrees about the X axis - for some reason .obj files saved from sketchup have this issue...
Vector3 v = new Vector3(x, -z, y);
vertices.Add(v * scale);
}
else if (faceRegex.IsMatch(s))
{
Match m = faceRegex.Match(s);
//Console.WriteLine(m.Groups["face_data"].Captures.Count);
//Console.WriteLine(m.Groups["vertex"].Captures.Count);
//Console.WriteLine(m.Groups["texture_coordinate"].Captures.Count);
//Console.WriteLine(m.Groups["vertex_normal"].Captures.Count);
//Face face = new Face();
Polygon polygon = new Polygon();
CaptureCollection vert_captures = m.Groups["vertex"].Captures;
CaptureCollection texcoord_captures = m.Groups["texture_coordinate"].Captures;
CaptureCollection norm_captures = m.Groups["vertex_normal"].Captures;
var vertexIndices = vert_captures.Cast<Capture>().Select(capture => int.Parse(capture.Value) - 1);
foreach (var vertexIndex in vertexIndices)
{
if (vertexIndex < 0 || vertexIndex > vertices.Count)
{
Console.WriteLine("Bad vertex index {0}, only {1} vertices loaded", vertexIndex, vertices.Count);
}
else
{
polygon.Add(vertices[vertexIndex]);
}
}
//for (int i = 0; i < vert_captures.Count; i++)
//{
// int vert_index = int.Parse(vert_captures[i].Value) - 1;
//
//}
if (texcoord_captures.Count == vert_captures.Count)
{
// TODO: Add texture coordinates to the face
}
if (norm_captures.Count == vert_captures.Count)
{
// TODO: Add vertex normals to the face
}
if (polygon.Vertices.Count() < 3)
{
Console.WriteLine("Bad face defined, less than 3 vertices");
}
else
{
foreach (var triangle in polygon.ToTriangles())
{
triMesh.AddTriangle(triangle);
}
}
}
}
}
//public List<Triangles> GetTriangles(Predicate<Triangle> trianglePredicate)
//{
//
//}
//
//
public List <TriangleMesh> Analyze()
{
List <TriangleMesh> meshes = new List <TriangleMesh>();
// While there is a triangle on the top:
// 1. Find a triangle on the top, remove it
// 2. Find all connected triangles, remove them
// 3. Add all removed triangles to a new mesh
// Find
var t = triangles;
List <TriangleIndices> ignore = new List <TriangleIndices>();
Func <Triangle, bool> TopTriangleCriteria = triangle => Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) == 1 && triangle.A.Z == MaxPoint.Z;
Func <Triangle, bool> BottomTriangleCriteria = triangle => Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) == -1 && triangle.A.Z == MinPoint.Z;
Func <Triangle, bool> PocketCriteria1 = triangle => !TopTriangleCriteria(triangle) && Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) > 0;
Func <Triangle, bool> PocketCriteria2 = triangle => !TopTriangleCriteria(triangle) && Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) >= 0;
while (t.Count > 0)
{
var triangleIndices = t[0];
var triangle = new Triangle(vertices[triangleIndices.a], vertices[triangleIndices.b], vertices[triangleIndices.c]);
var dot = Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ);
Func <float, bool> dotTestTop = dot_value => dot_value == 1;
Func <float, bool> dotTestBottom = dot_value => dot_value == -1;
if (TopTriangleCriteria(triangle))
{
var connected = GetConnectedTriangles(triangleIndices, ignore, TopTriangleCriteria);
ignore.AddRange(connected);
TriangleMesh mesh = new TriangleMesh();
foreach (var indices in connected)
{
t.Remove(indices);
var newTriangle = new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]);
mesh.AddTriangle(newTriangle);
}
//meshes.Add(mesh);
}
else if (BottomTriangleCriteria(triangle))
{
var connected = GetConnectedTriangles(triangleIndices, ignore, BottomTriangleCriteria);
ignore.AddRange(connected);
TriangleMesh mesh = new TriangleMesh();
foreach (var indices in connected)
{
t.Remove(indices);
var newTriangle = new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]);
mesh.AddTriangle(newTriangle);
}
//meshes.Add(mesh);
}
else if (PocketCriteria1(triangle))
{
var connected = GetConnectedTriangles(triangleIndices, ignore, PocketCriteria2);
ignore.AddRange(connected);
TriangleMesh mesh = new TriangleMesh();
foreach (var indices in connected)
{
t.Remove(indices);
var newTriangle = new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]);
mesh.AddTriangle(newTriangle);
}
meshes.Add(mesh);
}
else
{
//ignore.Add(t[0]);
t.RemoveAt(0);
}
}
return(meshes);
}
public Edge(TriangleMesh parent)
{
this.parentMesh = parent;
}
//public List<Triangles> GetTriangles(Predicate<Triangle> trianglePredicate)
//{
//
//}
//
//
public List<TriangleMesh> Analyze()
{
List<TriangleMesh> meshes = new List<TriangleMesh>();
// While there is a triangle on the top:
// 1. Find a triangle on the top, remove it
// 2. Find all connected triangles, remove them
// 3. Add all removed triangles to a new mesh
// Find
var t = triangles;
List<TriangleIndices> ignore = new List<TriangleIndices>();
Func<Triangle, bool> TopTriangleCriteria = triangle => Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) == 1 && triangle.A.Z == MaxPoint.Z;
Func<Triangle, bool> BottomTriangleCriteria = triangle => Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) == -1 && triangle.A.Z == MinPoint.Z;
Func<Triangle, bool> PocketCriteria1 = triangle => !TopTriangleCriteria(triangle) && Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) > 0;
Func<Triangle, bool> PocketCriteria2 = triangle => !TopTriangleCriteria(triangle) && Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ) >= 0;
while (t.Count > 0)
{
var triangleIndices = t[0];
var triangle = new Triangle(vertices[triangleIndices.a], vertices[triangleIndices.b], vertices[triangleIndices.c]);
var dot = Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ);
Func<float, bool> dotTestTop = dot_value => dot_value == 1;
Func<float, bool> dotTestBottom = dot_value => dot_value == -1;
if (TopTriangleCriteria(triangle))
{
var connected = GetConnectedTriangles(triangleIndices, ignore, TopTriangleCriteria);
ignore.AddRange(connected);
TriangleMesh mesh = new TriangleMesh();
foreach (var indices in connected)
{
t.Remove(indices);
var newTriangle = new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]);
mesh.AddTriangle(newTriangle);
}
//meshes.Add(mesh);
}
else if (BottomTriangleCriteria(triangle))
{
var connected = GetConnectedTriangles(triangleIndices, ignore, BottomTriangleCriteria);
ignore.AddRange(connected);
TriangleMesh mesh = new TriangleMesh();
foreach (var indices in connected)
{
t.Remove(indices);
var newTriangle = new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]);
mesh.AddTriangle(newTriangle);
}
//meshes.Add(mesh);
}
else if (PocketCriteria1(triangle))
{
var connected = GetConnectedTriangles(triangleIndices, ignore, PocketCriteria2);
ignore.AddRange(connected);
TriangleMesh mesh = new TriangleMesh();
foreach (var indices in connected)
{
t.Remove(indices);
var newTriangle = new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]);
mesh.AddTriangle(newTriangle);
}
meshes.Add(mesh);
}
else
{
//ignore.Add(t[0]);
t.RemoveAt(0);
}
}
return meshes;
}
/// <summary>
/// Split a mesh into meshes of connected triangles
/// </summary>
/// <returns></returns>
public List<TriangleMesh> SplitDisconnected()
{
List<TriangleMesh> meshes = new List<TriangleMesh>();
List<TriangleIndices> tempTriangles = new List<TriangleIndices>();
tempTriangles = triangles.ToList();
while(tempTriangles.Count > 0)
{
var mesh = new TriangleMesh();
var first = tempTriangles[0];
var connected = GetConnected(ref tempTriangles, first);
foreach (var indices in connected)
{
mesh.AddTriangle(new Triangle(vertices[indices.a], vertices[indices.b], vertices[indices.c]));
}
meshes.Add(mesh);
}
return meshes;
}
public static void Load(string filepath, TriangleMesh triMesh, float scale)
{
List <Vector3> vertices = new List <Vector3>();
string[] strings = System.IO.File.ReadAllLines(filepath);
// Lines starting with v are a vertex:
// "v 10.2426 4.5e-013 -31.7638"
Regex vertexRegex = new Regex(@"^v\s+(?<x>\S+)\s+(?<y>\S+)\s+(?<z>\S+)", RegexOptions.IgnoreCase);
// Lines starting with f are a face. The indices are <vertex>/<texture>/<normal>, where texture and normal are optional.
// "f 1/1/1 2/2/1 3/3/1 4/4/1 5/5/1"
Regex faceRegex = new Regex(@"^f(?<face_data>\s+(?<vertex>\d+)/?(?<texture_coordinate>\d+)?/?(?<vertex_normal>\d+)?)+", RegexOptions.IgnoreCase);
foreach (string s in strings)
{
if (vertexRegex.IsMatch(s))
{
Match m = vertexRegex.Match(s);
float x = float.Parse(m.Groups["x"].Value);
float y = float.Parse(m.Groups["y"].Value);
float z = float.Parse(m.Groups["z"].Value);
// Rotate 90 degrees about the X axis - for some reason .obj files saved from sketchup have this issue...
Vector3 v = new Vector3(x, -z, y);
vertices.Add(v * scale);
}
else if (faceRegex.IsMatch(s))
{
Match m = faceRegex.Match(s);
//Console.WriteLine(m.Groups["face_data"].Captures.Count);
//Console.WriteLine(m.Groups["vertex"].Captures.Count);
//Console.WriteLine(m.Groups["texture_coordinate"].Captures.Count);
//Console.WriteLine(m.Groups["vertex_normal"].Captures.Count);
//Face face = new Face();
Polygon polygon = new Polygon();
CaptureCollection vert_captures = m.Groups["vertex"].Captures;
CaptureCollection texcoord_captures = m.Groups["texture_coordinate"].Captures;
CaptureCollection norm_captures = m.Groups["vertex_normal"].Captures;
var vertexIndices = vert_captures.Cast <Capture>().Select(capture => int.Parse(capture.Value) - 1);
foreach (var vertexIndex in vertexIndices)
{
if (vertexIndex < 0 || vertexIndex > vertices.Count)
{
Console.WriteLine("Bad vertex index {0}, only {1} vertices loaded", vertexIndex, vertices.Count);
}
else
{
polygon.Add(vertices[vertexIndex]);
}
}
//for (int i = 0; i < vert_captures.Count; i++)
//{
// int vert_index = int.Parse(vert_captures[i].Value) - 1;
//
//}
if (texcoord_captures.Count == vert_captures.Count)
{
// TODO: Add texture coordinates to the face
}
if (norm_captures.Count == vert_captures.Count)
{
// TODO: Add vertex normals to the face
}
if (polygon.Vertices.Count() < 3)
{
Console.WriteLine("Bad face defined, less than 3 vertices");
}
else
{
foreach (var triangle in polygon.ToTriangles())
{
triMesh.AddTriangle(triangle);
}
}
}
}
}
