public void intersection()
{
Triangle vertical = new Triangle(Vector3.Zero, Vector3.UnitY, Vector3.UnitZ, Vector2.Zero, Vector2.UnitY, Vector2.UnitX);
Vector3 intersectionPoint;
float t = vertical.intersection(new Vector3(-0.5f, 0.2f, 0.2f), Vector3.UnitX, out intersectionPoint);
Assert.AreEqual(0.5f, t);
Assert.AreEqual(new Vector3(0, 0.2f, 0.2f), intersectionPoint);
Triangle horizontal = new Triangle(Vector3.Zero, Vector3.UnitX, Vector3.UnitZ, Vector2.Zero, Vector2.UnitX, Vector2.UnitY);
Vector3 intersectionPoint2;
float u = horizontal.intersection(new Vector3(0.2f, -0.5f, 0.2f), Vector3.UnitY, out intersectionPoint2);
Assert.AreEqual(0.5f, u);
Assert.AreEqual(new Vector3(0.2f, 0, 0.2f), intersectionPoint2);
Vector3 intersectionPoint3;
float v = vertical.intersection(new Vector3(0.2f, -0.5f, 0.2f), Vector3.UnitY, out intersectionPoint3);
Assert.AreEqual(-1.0f, v);
Assert.AreEqual(Vector3.Zero, intersectionPoint3);
Vector3 intersectionPoint4;
float w = vertical.intersection(new Vector3(-1.0f, 1.0f, 1.0f), new Vector3(1.1f, -1.0f, -1.0f), out intersectionPoint4);
Assert.Greater(w, 0);
Assert.AreEqual(0, intersectionPoint4.X);
Assert.AreEqual(new Vector3(-1.0f, 1.0f, 1.0f) + new Vector3(1.1f, -1.0f, -1.0f) * w, intersectionPoint4);
}
public HexSeg(float radius, int sub)
{
Radius = radius;
Triangles = new Triangle[6];
float halfRad = Radius / 2f;
float opp = Mathf.Sqrt(.75f) * Radius;
Vector3 p0 = new Vector3(-halfRad, 0, opp);
Vector3 p1 = new Vector3(halfRad, 0, opp);
Vector3 p2 = new Vector3(Radius, 0, 0);
Vector3 p3 = new Vector3(halfRad, 0, -opp);
Vector3 p4 = new Vector3(-halfRad, 0, -opp);
Vector3 p5 = new Vector3(-Radius, 0, 0);
Vector3 c = new Vector3(0, 0, 0);
Triangles[0] = new Triangle(c, p0, p1);
Triangles[1] = new Triangle(c, p1, p2);
Triangles[2] = new Triangle(c, p2, p3);
Triangles[3] = new Triangle(c, p3, p4);
Triangles[4] = new Triangle(c, p4, p5);
Triangles[5] = new Triangle(c, p5, p0);
foreach (Triangle triangle in Triangles)
{
triangle.Subdivide(sub);
}
}
public ActiveTriangle(IScene scene, Triangle tri)
{
this.tri = tri;
this.scene = scene;
controller = new TriangleControllerNeutral(this);
view = new ActiveTriangleView (this);
}
public void onUV()
{
Triangle t = new Triangle(Vector3.Zero, Vector3.UnitX, Vector3.UnitY, Vector2.Zero, Vector2.UnitX, Vector2.UnitY, Vector2.Zero, Vector2.UnitX, Vector2.UnitY);
Assert.True(t.isOnUVPixel(new Vector2(-2.0f, 2.0f), new Vector2(3.0f, -1.0f))); //Surrounds triangle
Assert.True(t.isOnUVPixel(new Vector2(0, 0.5f), new Vector2(0.5f, 0))); //Completely inside
Assert.True(t.isOnUVPixel(new Vector2(0.5f, 1.0f), new Vector2(1.0f, 0.5f))); //On the edge
Assert.False(t.isOnUVPixel(new Vector2(-2.0f, 2.0f), new Vector2(-1.0f, 0))); //Not inside
}
static void Main()
{
Shape[] someShapes = new Shape[6];
someShapes[0] = new Rectangle(5, 6);
someShapes[1] = new Triangle(5, 6);
someShapes[2] = new Circle(4);
someShapes[3] = new Triangle(11, 7);
someShapes[4] = new Rectangle(5, 6);
someShapes[5] = new Circle(15);
foreach (Shape shape in someShapes)
{
Console.WriteLine("Shape type: {0} \nSurface: {1}", shape.GetType(), shape.CalculateSurface());
Console.WriteLine();
}
}
public static int GetSharpestPoint(Triangle tri)
{
int sharpest = 0;
double least = PointUtils.SquaredDistance (tri.b,tri.c);
double temp = PointUtils.SquaredDistance (tri.a,tri.c);
if (temp < least) {
least = temp;
sharpest = 1;
}
temp = PointUtils.SquaredDistance (tri.a,tri.b);
if (temp < least) {
sharpest = 2;
}
return sharpest;
}
public Triangle(Triangle t, Vector3 offset, Quaternion rotation)
{
Matrix4 transform = new Matrix4(new Vector4(Vector3.Transform(Vector3.UnitX, rotation), 0),
new Vector4(Vector3.Transform(Vector3.UnitY, rotation), 0),
new Vector4(Vector3.Transform(Vector3.UnitZ, rotation), 0),
new Vector4(offset, 1));
_mVerts = new Vector3[3] { Vector3.Transform(t.x, transform), Vector3.Transform(t.y, transform), Vector3.Transform(t.z, transform) };
calculateNormal();
_tVerts = new Vector2[3] { t.u, t.v, t.w};
lightMapInverseMatrix = new Vector2[2];
if (t.isLightmapped)
{
isLightmapped = true;
_lVerts = new Vector2[3] { t.a, t.b, t.c };
calculateInverseMatrix();
degenerate = areColinear(c - a, b - a);
}
}
public float intersection(Vector3 start, Vector3 direction, out Triangle intersectedTriangle)
{
float leastDistance = float.MaxValue;
intersectedTriangle = null;
//If the line doesn't go through this octree then it is unobstructed
if (bounds.lineIntersects(start, direction))
{
if (children.Length == 0)
{
foreach (Triangle t in tris)
{
Vector3 throwAway;
float nextDistance = t.intersection(start, direction, out throwAway);
if (nextDistance > 0 && nextDistance < leastDistance)
{
leastDistance = nextDistance;
intersectedTriangle = t;
}
}
}
else
{
foreach (Octree o in children)
{
Triangle nextIntersection;
float nextDistance = o.intersection(start, direction, out nextIntersection);
if (nextDistance > 0 && nextDistance < leastDistance)
{
leastDistance = nextDistance;
intersectedTriangle = nextIntersection;
}
}
}
}
return leastDistance != float.MaxValue ? leastDistance : -1.0f;
}
// Ear clipping algorithm to separate a polygon into triangles
// This should work on any list of triangles with no holes.
public IEnumerable<Triangle> ToTriangles()
{
Plane p = Plane;
if (vertices.Count == 3)
{
}
while (vertices.Count >= 3)
{
int verts = vertices.Count;
int i = 0;
// Find an ear on the face, remove it
for (i = 0; i < verts; i++)
{
Vector3 v1 = vertices[i];
Vector3 v2 = vertices[(i + 1) % verts];
Vector3 v3 = vertices[(i + 2) % verts];
var tri = new Triangle(v1, v2, v3);
bool anyPointInPolygon = false;
foreach (var otherPoint in vertices)
{
if (otherPoint != v1 && otherPoint != v2 && otherPoint != v3 && tri.IsPointInTriangle(otherPoint))
{
anyPointInPolygon = true;
break;
}
}
// First check: see if any point in the original polygon is inside the new triangle
if (anyPointInPolygon)
{
// Can't use this triangle, move onto the next one
}
else
{
// Make sure the triangle points the right way.
if (Vector3.Dot(tri.Plane.Normal, p.Normal) > 0.9f)
{
yield return tri;
this.vertices.RemoveAt((i + 1) % verts);
break;
}
else
{
}
}
}
if (i == verts)
{
// Got a bad face
break;
}
}
}
//Already made triangles constructor(terrain meshes)
public MeshChunk(Triangle[] triangles)
{
//unused things
name = "THIS MESH CHUNK HAS NO NAME";
id = "THIS MESH CHUNK HAS NO ID";
vertexSize = 0;
positionOffset = 0;
textureOffset = 0;
texture2Offset = 0;
normalOffset = 0;
startIndex = 0;
vertexOffset = 0;
materialObjectName = "THIS MESH CHUNK HAS NO MATERIAL OBJECT";
chunkOffset = new Vector3(); ;
tris = triangles;
receives = triangles[0].isLightmapped;
usesTwoTexCoords = triangles[0].isLightmapped;
casts = true;
verts = new float[triangles.Length * 3 * vertexElementCount];
vertexCount = (uint)triangles.Length * 3;
indices = new uint[triangles.Length * 3];
indexCount = (uint)indices.Length;
for (int i = 0; i < tris.Length; i++)
{
int vertexIndex = i * vertexElementCount * 3;
int indexIndex = i * 3;
indices[indexIndex + 0] = (uint)indexIndex + 0;
indices[indexIndex + 1] = (uint)indexIndex + 1;
indices[indexIndex + 2] = (uint)indexIndex + 2;
verts[vertexIndex + 0] = tris[i].x.X;
verts[vertexIndex + 1] = tris[i].x.Y;
verts[vertexIndex + 2] = tris[i].x.Z;
verts[vertexIndex + 3] = tris[i].normal.X;
verts[vertexIndex + 4] = tris[i].normal.Y;
verts[vertexIndex + 5] = tris[i].normal.Z;
verts[vertexIndex + 6] = tris[i].u.X;
verts[vertexIndex + 7] = tris[i].u.Y;
vertexIndex += vertexElementCount;
verts[vertexIndex + 0] = tris[i].y.X;
verts[vertexIndex + 1] = tris[i].y.Y;
verts[vertexIndex + 2] = tris[i].y.Z;
verts[vertexIndex + 3] = tris[i].normal.X;
verts[vertexIndex + 4] = tris[i].normal.Y;
verts[vertexIndex + 5] = tris[i].normal.Z;
verts[vertexIndex + 6] = tris[i].v.X;
verts[vertexIndex + 7] = tris[i].v.Y;
vertexIndex += vertexElementCount;
verts[vertexIndex + 0] = tris[i].z.X;
verts[vertexIndex + 1] = tris[i].z.Y;
verts[vertexIndex + 2] = tris[i].z.Z;
verts[vertexIndex + 3] = tris[i].normal.X;
verts[vertexIndex + 4] = tris[i].normal.Y;
verts[vertexIndex + 5] = tris[i].normal.Z;
verts[vertexIndex + 6] = tris[i].w.X;
verts[vertexIndex + 7] = tris[i].w.Y;
area += 0.5 * Vector3.Cross(tris[i].y - tris[i].x, tris[i].z - tris[i].x).Length;
}
}
//Reading from a file constructor (normal meshes)
public MeshChunk(BinaryReader file, long dataOffset, BiowareStruct chunkDef, BiowareStruct vertStruct)
{
uint listLength;
long reference;
long position = file.BaseStream.Position;
materialObjectName = "";
//Read the name
file.BaseStream.Seek(chunkDef.fields[0].index + position, SeekOrigin.Begin);
name = IOUtilities.readECString(file, dataOffset + file.ReadInt32());
//Seek to vertex size offset and read it
file.BaseStream.Seek(chunkDef.fields[1].index + position, SeekOrigin.Begin);
vertexSize = (int)file.ReadUInt32();
//Seek to vertex count offset and read it
file.BaseStream.Seek(chunkDef.fields[2].index + position, SeekOrigin.Begin);
vertexCount = file.ReadUInt32();
verts = new float[vertexCount * vertexElementCount];
//Seek to vertex offset offset and read it
file.BaseStream.Seek(chunkDef.fields[7].index + position, SeekOrigin.Begin);
vertexOffset = file.ReadUInt32();
//Seek to index count offset and read it
file.BaseStream.Seek(chunkDef.fields[3].index + position, SeekOrigin.Begin);
indexCount = file.ReadUInt32();
indices = new uint[indexCount];
//Seek to index offset offset and read it
file.BaseStream.Seek(chunkDef.fields[10].index + position, SeekOrigin.Begin);
startIndex = file.ReadUInt32();
//Seek to vertex declarator offset and read in the list reference
file.BaseStream.Seek(chunkDef.fields[13].index + position, SeekOrigin.Begin);
reference = file.ReadUInt32();
//Make the triangle array to be filled later
tris = new Triangle[indexCount / 3];
//Seek to the list
file.BaseStream.Seek(reference + dataOffset, SeekOrigin.Begin);
listLength = file.ReadUInt32();
reference = file.BaseStream.Position;
usesTwoTexCoords = false;
Usage type;
//Get the offsets
for (int i = 0; i < listLength; i++)
{
file.BaseStream.Seek(reference + (vertStruct.structSize * i) + vertStruct.fields[3].index, SeekOrigin.Begin);
type = (Usage)file.ReadUInt32();
file.BaseStream.Seek(reference + (vertStruct.structSize * i) + vertStruct.fields[1].index, SeekOrigin.Begin);
switch (type)
{
case Usage.POSITION:
positionOffset = file.ReadInt32();
break;
case Usage.TEXCOORD:
int offset = file.ReadInt32();
file.BaseStream.Seek(reference + (vertStruct.structSize * i) + vertStruct.fields[4].index, SeekOrigin.Begin);
uint index = file.ReadUInt32();
if (index == 0)
{
textureOffset = offset;
texture2Offset = offset;
}
else if (index == 1)
{
texture2Offset = offset;
usesTwoTexCoords = true;
}
break;
case Usage.NORMAL:
normalOffset = file.ReadInt32();
break;
}
}
}
public override void readData()
{
int reference, length;
long startOfList;
//Get the binary reader
BinaryReader file = binaryFile.openReader();
//Set up the struct definitions
setStructDefinitions();
//Get the sector ID
file.BaseStream.Seek(binaryFile.dataOffset + infoStruct.fields[SECTOR_ID_INDEX].index, SeekOrigin.Begin);
_sectorID = file.ReadInt32();
name = "Sector " + sectorID;
/*----------MAP VERTS----------*/
//Get the reference to the map vertex list and go there
file.BaseStream.Seek(binaryFile.dataOffset + infoStruct.fields[MAP_VERTEX_LIST_INDEX].index, SeekOrigin.Begin);
reference = file.ReadInt32();
file.BaseStream.Seek(binaryFile.dataOffset + reference, SeekOrigin.Begin);
//Fill the map vertex list with all the map verts
length = file.ReadInt32();
_mapVerts = new List<TerrainMapVertex>(length);
startOfList = file.BaseStream.Position;
for (int i = 0; i < length; i++)
{
//Seek to the next struct in the list
file.BaseStream.Seek(startOfList + (i * mapVertexStruct.structSize), SeekOrigin.Begin);
//Add it to the list
_mapVerts.Add(new TerrainMapVertex(mapVertexStruct, file));
}
/*----------MAP EDGES----------*/
//Get the reference to the map edge list and go there
file.BaseStream.Seek(binaryFile.dataOffset + infoStruct.fields[MAP_EDGE_LIST_INDEX].index, SeekOrigin.Begin);
reference = file.ReadInt32();
file.BaseStream.Seek(binaryFile.dataOffset + reference, SeekOrigin.Begin);
//Fill the map edge list with all the map edges
length = file.ReadInt32();
_mapEdges = new List<TerrainMapEdge>(length);
startOfList = file.BaseStream.Position;
TerrainMapEdge tempEdge;
for (int i = 0; i < length; i++)
{
//Seek to the next struct in the list
file.BaseStream.Seek(startOfList + (i * mapEdgeStruct.structSize), SeekOrigin.Begin);
//Create the edge
tempEdge = new TerrainMapEdge(mapEdgeStruct, file);
//Get the actual index in the array of the map vert
for (int j = 0; j < _mapVerts.Count; j++)
{
if (_mapVerts[j].id == tempEdge.startVertexIndex)
{
tempEdge.startVertexIndex = j;
break;
}
}
//Add it to the list
_mapEdges.Add(tempEdge);
}
/*----------MAP FACES----------*/
//Get the reference to the map face list and go there
file.BaseStream.Seek(binaryFile.dataOffset + infoStruct.fields[MAP_FACE_LIST_INDEX].index, SeekOrigin.Begin);
reference = file.ReadInt32();
file.BaseStream.Seek(binaryFile.dataOffset + reference, SeekOrigin.Begin);
//Fill the map face list with all the map faces
length = file.ReadInt32();
_mapFaces = new List<TerrainMapFace>(length);
startOfList = file.BaseStream.Position;
TerrainMapFace tempFace;
for (int i = 0; i < length; i++)
{
//Seek to the next struct in the list
file.BaseStream.Seek(startOfList + (i * mapFaceStruct.structSize), SeekOrigin.Begin);
//Create the face
tempFace = new TerrainMapFace(mapFaceStruct, file);
//Find the actual edge indices
for (int edgeIndex = 0; edgeIndex < 3; edgeIndex++)
{
for (int j = 0; j < _mapEdges.Count; j++)
{
if (tempFace[edgeIndex] == _mapEdges[j].id)
{
tempFace[edgeIndex] = j;
break;
}
}
}
//Add it to the list
_mapFaces.Add(tempFace);
}
/*----------MESH VERTS----------*/
//Get the reference to the mesh vertex list and go there
file.BaseStream.Seek(binaryFile.dataOffset + infoStruct.fields[MESH_VERTEX_LIST_INDEX].index, SeekOrigin.Begin);
reference = file.ReadInt32();
file.BaseStream.Seek(binaryFile.dataOffset + reference, SeekOrigin.Begin);
//Fill the vertex list with all the vertex
length = file.ReadInt32();
_verts = new List<TerrainMeshVertex>(length);
startOfList = file.BaseStream.Position;
for (int i = 0; i < length; i++)
{
//Seek to the next struct in the list
file.BaseStream.Seek(startOfList + (i * meshVertexStruct.structSize), SeekOrigin.Begin);
//Add it to the list
_verts.Add(new TerrainMeshVertex(meshVertexStruct, file));
}
/*----------MESH EDGES----------*/
//Get the reference to the mesh edge list and go there
file.BaseStream.Seek(binaryFile.dataOffset + infoStruct.fields[MESH_EDGE_LIST_INDEX].index, SeekOrigin.Begin);
reference = file.ReadInt32();
file.BaseStream.Seek(binaryFile.dataOffset + reference, SeekOrigin.Begin);
//Fill the edge list with all the edge
length = file.ReadInt32();
_edges = new List<TerrainMeshEdge>(length);
startOfList = file.BaseStream.Position;
TerrainMeshEdge tempMeshEdge;
for (int i = 0; i < length; i++)
{
//Seek to the next struct in the list
file.BaseStream.Seek(startOfList + (i * meshEdgeStruct.structSize), SeekOrigin.Begin);
//Create the edge
tempMeshEdge = new TerrainMeshEdge(meshEdgeStruct, file);
//Get the actual index in the array of the mesh vert
for (int j = 0; j < _mapVerts.Count; j++)
{
if (_verts[j].id == tempMeshEdge.startVertexIndex)
{
tempMeshEdge.startVertexIndex = j;
break;
}
}
//Add it to the list
_edges.Add(tempMeshEdge);
}
/*----------MESH FACES----------*/
//Get the reference to the mesh face list and go there
file.BaseStream.Seek(binaryFile.dataOffset + infoStruct.fields[MESH_FACE_LIST_INDEX].index, SeekOrigin.Begin);
reference = file.ReadInt32();
file.BaseStream.Seek(binaryFile.dataOffset + reference, SeekOrigin.Begin);
//Fill the face list with all the faces
length = file.ReadInt32();
_faces = new List<TerrainMeshFace>(length);
startOfList = file.BaseStream.Position;
TerrainMeshFace tempMeshFace;
for (int i = 0; i < length; i++)
{
//Seek to the next struct in the list
file.BaseStream.Seek(startOfList + (i * meshFaceStruct.structSize), SeekOrigin.Begin);
//Make the face
tempMeshFace = new TerrainMeshFace(meshFaceStruct, file);
//Find the actual edge indices
for (int edgeIndex = 0; edgeIndex < 3; edgeIndex++)
{
for (int j = 0; j < _edges.Count; j++)
{
if (tempMeshFace[edgeIndex] == _edges[j].id)
{
tempMeshFace[edgeIndex] = j;
break;
}
}
}
//Find the actual map face index
for (int j = 0; j < _mapFaces.Count; j++)
{
if (tempMeshFace.mapId == _mapFaces[j].id)
{
tempMeshFace.mapId = j;
break;
}
}
//Add it to the list
_faces.Add(tempMeshFace);
}
file.Close();
chunks = new MeshChunk[1];
Triangle[] tris = new Triangle[faces.Count];
//Hold temporary vertex values
Vector3 x, y, z;
Vector2 u, v, w;
//For each faces make a triangle
for (int i = 0; i < faces.Count; i++)
{
//Get the mesh coordinates
x = verts[edges[faces[i].edges[0]].startVertexIndex].position;
y = verts[edges[faces[i].edges[1]].startVertexIndex].position;
z = verts[edges[faces[i].edges[2]].startVertexIndex].position;
//Get the map coordinates (lightmap coordinates are the same)
u = mapVerts[mapEdges[mapFaces[faces[i].mapId].edges[0]].startVertexIndex].position.Xy;
v = mapVerts[mapEdges[mapFaces[faces[i].mapId].edges[1]].startVertexIndex].position.Xy;
w = mapVerts[mapEdges[mapFaces[faces[i].mapId].edges[2]].startVertexIndex].position.Xy;
//Make the triangle
tris[i] = new Triangle(x, y, z, u, v, w, u, v, w);
}
chunks[0] = new MeshChunk(tris);
chunks[0].casts = true;
chunks[0].receives = true;
}
public void AddTriangle(Triangle tri)
{
AddTriangle(tri.A, tri.B, tri.C);
}
static double findRightAreaMethod(string NameOfGeo, Square square, Rectangle rectangle, ParalelloGram paralelloGram, Trapez trapez, Triangle triangle)
{
if (NameOfGeo.Equals("Square"))
{
return(square.AreaForSquare());
}
else if (NameOfGeo.Equals("Rectangle"))
{
return(rectangle.AreaForRectangle());
}
else if (NameOfGeo.Equals("paralelloGram"))
{
return(paralelloGram.AreaForParalleloGram());
}
else if (NameOfGeo.Equals("Trapez"))
{
return(trapez.AreaForTrapez());
}
else if (NameOfGeo.Equals("Triangle"))
{
return(triangle.AreaForTriangle());
}
else
{
return(0);
}
}
private bool allOnSameSideOfTriangle(Triangle t)
{
bool topAPositive = Vector3.Dot(t.normal, max - t.x) > 0;
bool topBPositive = Vector3.Dot(t.normal, topB - t.x) > 0;
bool topCPositive = Vector3.Dot(t.normal, topC - t.x) > 0;
bool topDPositive = Vector3.Dot(t.normal, topD - t.x) > 0;
bool bottomAPositive = Vector3.Dot(t.normal, bottomA - t.x) > 0;
bool bottomBPositive = Vector3.Dot(t.normal, bottomB - t.x) > 0;
bool bottomCPositive = Vector3.Dot(t.normal, min - t.x) > 0;
bool bottomDPositive = Vector3.Dot(t.normal, bottomD - t.x) > 0;
bool allPositive = topAPositive && topBPositive && topCPositive && topDPositive &&
bottomAPositive && bottomBPositive && bottomCPositive && bottomDPositive;
bool allNegative = !(topAPositive || topBPositive || topCPositive || topDPositive ||
bottomAPositive || bottomBPositive || bottomCPositive || bottomDPositive);
return allPositive || allNegative;
}
public TrianglePlaneIntersect(Triangle triangle, Plane plane)
{
// Find the intersections between edges on the triangle and the plane.
List<Vector3> vertices = new List<Vector3>(3);
List<float> distances = new List<float>(3);
List<Vector3> onPlane = new List<Vector3>();
foreach (Vector3 v in triangle.Vertices)
{
vertices.Add(v);
distances.Add(plane.Distance(v));
}
for (int i = 0; i < 3; i++)
{
float d1 = distances[i];
float d2 = distances[(i + 1) % 3];
float d3 = distances[(i + 2) % 3];
Vector3 v1 = vertices[i];
Vector3 v2 = vertices[(i + 1) % 3];
Vector3 v3 = vertices[(i + 2) % 3];
if (d1 * d2 < 0)
{
// One point on the edge from D1 to D2
Vector3 intersect = new Vector3(v2 * d1 - v1 * d2) / (d1 - d2);
onPlane.Add(intersect);
if (d3 == 0)
{
// Other point is on D3
onPlane.Add(v3);
break;
}
else
{
if (d1 * d3 < 0)
{
// Intersect with v1 to v3
onPlane.Add(new Vector3(v3 * d1 - v1 * d3) / (d1 - d3));
break;
}
else if (d2 * d3 < 0)
{
// Intersect with v2 to v3
onPlane.Add(new Vector3(v3 * d2 - v2 * d3) / (d2 - d3));
break;
}
else
{
// how the heck would we get here?
}
}
}
if (d1 == 0 && d2 == 0)
{
if (d3 == 0)
{
// Triangle intersects perfectly with the plane - need to return all 3 edges here?
all_intersect = true;
break;
}
else
{
onPlane.Add(v1);
onPlane.Add(v2);
break;
}
}
//if (d1 * d2 < 0)
//{
// // Edge of the triangle crosses the plane, interpolate to get the intersection point
// Vector3 intersect = new Vector3(v2 * d1 - v1 * d2) / (d1 - d2);
// onPlane.Add(intersect);
//}
}
if (onPlane.Count == 2)
{
pointA = onPlane[0];
pointB = onPlane[1];
intersects = true;
}
if (intersects)
{
// Check the vector direction - flip the vertices if necessary
if (Vector3.Dot(Vector3.Cross(pointB - pointA, plane.Normal), triangle.Plane.Normal) < 0)
{
pointA = onPlane[1];
pointB = onPlane[0];
}
}
}
public void Subdivide(int i=1)
{
SubPoints = new Vector3[3];
SubPoints[0] = Points[0] + ((Points[1] - Points[0])/2f);
SubPoints[1] = Points[1] + ((Points[2] - Points[1])/2f);
SubPoints[2] = Points[2] + ((Points[0] - Points[2])/2f);
Subs = new Triangle[4];
Subs[0] = new Triangle(Points[0], SubPoints[0], SubPoints[2]);
Subs[1] = new Triangle(Points[1], SubPoints[1], SubPoints[0]);
Subs[2] = new Triangle(Points[2], SubPoints[2], SubPoints[1]);
Subs[3] = new Triangle(SubPoints[0], SubPoints[1], SubPoints[2]);
if(i > 1)
{
foreach(Triangle sub in Subs)
{
sub.Subdivide(i - 1);
}
}
}
public static void Main(string[] args)
{
Dot p1 = new Dot(2, 2.5);
Dot p2 = new Dot();
Dot p3 = new Dot(p1);
Console.WriteLine("{0:N}", p1);
Console.WriteLine("{0:N}", p2);
Console.WriteLine("{0:N}", p3);
Console.WriteLine();
Circle c1 = new Circle(3, 2, 2.5);
Circle c2 = new Circle();
Circle c3 = new Circle(6.5, new Dot(10, 12));
Console.WriteLine("{0}", c1);
Console.WriteLine("{0}", c2);
Console.WriteLine("{0}", c3);
Console.WriteLine();
Square s1 = new Square(2.25, 1.0, 0.0);
Square s2 = new Square();
Square s3 = new Square(6.0, p1);
Console.WriteLine("{0}", s1);
Console.WriteLine("{0}", s2);
Console.WriteLine("{0}", s3);
Console.WriteLine();
Rectangle r1 = new Rectangle(5.0, 9.5, new Dot(8.1, 5.02));
Rectangle r2 = new Rectangle(1.5, 3.9, 2, 2.5);
Rectangle r3 = new Rectangle();
Console.WriteLine("{0}\n{1}\n{2}", r1, r2, r3);
Console.WriteLine();
Triangle tr1 = new Triangle(8.0, 6.5, 10.0, 15.0, 2.0, 2.5);
Triangle tr2 = new Triangle();
Triangle tr3 = new Triangle(12.5, 15.2, p1, p3);
Console.WriteLine("{0}\n{1}\n{2}", tr1, tr2, tr3);
Console.WriteLine();
Trapezium trap1 = new Trapezium();
Trapezium trap2 = new Trapezium(10.1, 18.25, 20.4, 10.0, 10.0, 4.0, 4.0);
Trapezium trap3 = new Trapezium(9.32, 5.2, 6.0, new Dot(15, 12), p1);
Console.WriteLine("{0}\n{1}\n{2}", trap1, trap2, trap3);
Console.WriteLine();
Console.WriteLine("There are {0} shapes here.", Shape.GetCount());
Console.WriteLine();
Console.Write("Press any key to continue . . . ");
Console.ReadKey(true);
}
public void onKeyPress(object o, KeyPressEventArgs args)
{
Logger.Log ("key press " + args.Event.Key);
if (args.Event.Key == Gdk.Key.p && state != MyState.AddingPoints) {
state = MyState.AddingPoints;
return;
}
if (args.Event.Key == Gdk.Key.p && state == MyState.AddingPoints) {
foreach (PointD p in demo.points) {
VertexStructure.Add (ref vertices,p);
}
demo.points.Clear ();
demo.vertexStructs.Add (vertices);
state = MyState.NotAddingPoints;
vertices = null;
return;
}
if (args.Event.Key == Gdk.Key.t) {
foreach (VertexStructure polygon in demo.vertexStructs) {
List<PointD> pointList = Geometry.ComputationalGeometry.GetTriangulateTrianglePoints (polygon,VertexStructure.Count(polygon));
List<PointD>.Enumerator iter = pointList.GetEnumerator();
iter.MoveNext ();
do {
PointD a = iter.Current;
iter.MoveNext ();
PointD b = iter.Current;
iter.MoveNext ();
PointD c = iter.Current;
Triangle t = new Triangle (a, b, c);
ActiveTriangle nt = new ActiveTriangle (demo,t);
demo.addObject(nt);
} while(iter.MoveNext ());
Logger.Log ("Iterated");
}
demo.vertexStructs.Clear ();
return;
}
if (args.Event.Key == Gdk.Key.e || args.Event.Key == Gdk.Key.n) {
List<IGameObject> goList = demo.getObjectsByTag (ActiveTriangle.tag);
foreach (IGameObject go in goList){
ActiveTriangle t = (ActiveTriangle) go;
switch (args.Event.Key) {
case Gdk.Key.e:
t.setEvil ();
break;
case Gdk.Key.n:
t.setNeutral ();
break;
default:
t.setNeutral ();
break;
}
}
}
if (args.Event.Key == Gdk.Key.o) {
demo.addObject (new Protagonist (demo));
}
}
//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 Boolean triangleIntersects(Triangle t)
{
//Separating axis theorem
return !((t.x.X > max.X && t.y.X > max.X && t.z.X > max.X) || //Max X plane
(t.x.Y > max.Y && t.y.Y > max.Y && t.z.Y > max.Y) || //Max Y plane
(t.x.Z > max.Z && t.y.Z > max.Z && t.z.Z > max.Z) || //Max Z plane
(t.x.X < min.X && t.y.X < min.X && t.z.X < min.X) || //Min X plane
(t.x.Y < min.Y && t.y.Y < min.Y && t.z.Y < min.Y) || //Min Y plane
(t.x.Z < min.Z && t.y.Z < min.Z && t.z.Z < min.Z) || //Min Z plane
allOnSameSideOfTriangle(t)); //Triangle plane
}
public TriangleRayIntersect(Triangle triangle, Ray ray)
{
point = Vector3.Zero;
intersects = false;
float distance = triangle.Plane.Distance(ray);
if (distance <= 0 || float.IsNaN(distance))
{
// Plane is behind the ray, no intersection
return;
}
point = ray.Direction * distance + ray.Start;
// Make sure the point is within the triangle
foreach (Plane p in triangle.EdgePlanes)
{
if (p.Distance(point) < 0)
{
// Outside of triangle, no intersection
return;
}
}
intersects = true;
}
public Boolean containsTriangle(Triangle t)
{
return containsPoint(t.x) && containsPoint(t.y) && containsPoint(t.z);
}
/// <summary>
/// Get all connected triangles that satisfy a certain criteria
/// </summary>
/// <returns></returns>
public TriangleIndices[] GetConnectedTriangles(TriangleIndices triangleIndices, List<TriangleIndices> ignoreIndices, Func<Triangle, bool> dotCriteria)
{
List<TriangleIndices> connected = new List<TriangleIndices>();
connected.Add(triangleIndices);
//ignoreIndices.Add(triangleIndices);
foreach (var edge in triangleIndices.edges)
{
foreach (var otherindex in edge.triangles)
{
if (ignoreIndices.Contains(otherindex) || connected.Contains(otherindex))
{
// Don't need to look at this one
}
else
{
var triangle = new Triangle(vertices[otherindex.a], vertices[otherindex.b], vertices[otherindex.c]);
var dot = Vector3.Dot(triangle.Plane.Normal, Vector3.UnitZ);
if (dotCriteria(triangle))
{
// Satisfies criteria, keep the triangle
List<TriangleIndices> newIgnore = new List<TriangleIndices>();
newIgnore.AddRange(ignoreIndices);
newIgnore.AddRange(connected);
var moreconnected = GetConnectedTriangles(otherindex, newIgnore, dotCriteria);
//ignoreIndices.AddRange(moreconnected);
connected.AddRange(moreconnected);
}
}
}
}
return connected.ToArray();
}
