public void Mesh_CreateTriangle()
{
string v1Traits = "v1";
string v2Traits = "v2";
string v3Traits = "v3";
string faceTraits = "face1";
var mesh = new StringMesh();
var face = mesh.CreateTriangle(v1Traits, v2Traits, v3Traits, faceTraits);
// Recover the vertices and edges
var v1 = face.Bounding.Source;
var v2 = face.Bounding.Target;
var v3 = face.Bounding.Next.Target;
var e12 = v1.HalfedgeTo(v2);
var e23 = v2.HalfedgeTo(v3);
var e31 = v3.HalfedgeTo(v1);
var e21 = e12.Opposite;
var e32 = e23.Opposite;
var e13 = e31.Opposite;
// Check that the vertices and face is build as expected
Assert.AreEqual(v1Traits, v1.Traits);
Assert.AreEqual(v2Traits, v2.Traits);
Assert.AreEqual(v3Traits, v3.Traits);
Assert.AreEqual(faceTraits, face.Traits);
// Check that the Halfedges are built correctly
// Vertices
Assert.AreEqual(v1, e12.Source);
Assert.AreEqual(v2, e12.Target);
Assert.AreEqual(v2, e23.Source);
Assert.AreEqual(v3, e23.Target);
Assert.AreEqual(v3, e31.Source);
Assert.AreEqual(v1, e31.Target);
// Edges
Assert.AreEqual(e12.Edge, e21.Edge);
Assert.AreEqual(e23.Edge, e32.Edge);
Assert.AreEqual(e31.Edge, e13.Edge);
// forward cycle
Assert.AreEqual(e23, e12.Next);
Assert.AreEqual(e31, e23.Next);
Assert.AreEqual(e12, e31.Next);
// reverse cycle
Assert.AreEqual(e12, e23.Previous);
Assert.AreEqual(e23, e31.Previous);
Assert.AreEqual(e31, e12.Previous);
Assert.AreEqual(1, mesh.Faces.Count);
}
public void Mesh_AdjoinTriangle()
{
string v1Traits = "v1";
string v2Traits = "v2";
string v3Traits = "v3";
string v4Traits = "v4";
string faceTraits = "face1";
var mesh = new StringMesh();
var face = mesh.CreateTriangle(v2Traits, v1Traits, v4Traits, faceTraits);
var face2Traits = "face2";
var face3Traits = "face3";
var face4Traits = "face4";
// Recover the first vertex
var v2 = face.Bounding.Source;
var v1 = face.Bounding.Target;
var v4 = face.Bounding.Next.Target;
// Use it to make next triangle - careful with sequence V2 -> v1
var face2 = mesh.CreateTriangle(v1, v2, v3Traits, face2Traits);
var v3 = face2.Bounding.Next.Target;
// Recover halfedges
var e21 = v2.HalfedgeTo(v1);
var e14 = v1.HalfedgeTo(v4);
var e42 = v4.HalfedgeTo(v2);
var e31 = v3.HalfedgeTo(v1);
var e32 = v3.HalfedgeTo(v2);
var e12 = e21.Opposite;
var e41 = e14.Opposite;
var e24 = e42.Opposite;
var e13 = e31.Opposite;
var e23 = e32.Opposite;
// Check new outside boundary loop - forward
Assert.AreEqual(e13, e41.Next);
Assert.AreEqual(e32, e13.Next);
Assert.AreEqual(e24, e32.Next);
Assert.AreEqual(e41, e24.Next);
// Check new outside boundary loop - reverse
Assert.AreEqual(e13, e32.Previous);
Assert.AreEqual(e41, e13.Previous);
Assert.AreEqual(e24, e41.Previous);
Assert.AreEqual(e32, e24.Previous);
Assert.AreEqual(2, mesh.Faces.Count);
}
public void Mesh_CreateCube()
{
var vt1 = "v1";
var vt2 = "v2";
var vt3 = "v3";
var vt4 = "v4";
var vt5 = "v5";
var vt6 = "v6";
var vt7 = "v7";
var vt8 = "v8";
var mesh = new StringMesh();
}
public void Mesh_CreateTetrahedron()
{
string v1Traits = "v1";
string v2Traits = "v2";
string v3Traits = "v3";
string faceTraits = "face1";
var mesh = new StringMesh();
var face = mesh.CreateTriangle(v1Traits, v2Traits, v3Traits, faceTraits);
var v4Traits = "v4";
var face2Traits = "face2";
var face3Traits = "face3";
var face4Traits = "face4";
// Recover the first vertex
var v1 = face.Bounding.Source;
var v2 = face.Bounding.Target;
var v3 = face.Bounding.Next.Target;
// Use it to make next triangle - careful with sequence V2 -> v1
var face2 = mesh.CreateTriangle(v2, v1, v4Traits, face2Traits);
var v4 = face2.Bounding.Next.Target;
// Recover halfedges
var e21 = v2.HalfedgeTo(v1);
var e14 = v1.HalfedgeTo(v4);
var e42 = v4.HalfedgeTo(v2);
var e12 = e21.Opposite;
var e41 = e14.Opposite;
var e24 = e42.Opposite;
var face3 = mesh.CreateTriangle(v3, v4, v1, face3Traits);
var face4 = mesh.CreateFace(e24, face4Traits);
foreach (var he in mesh.Halfedges)
{
Assert.IsNotNull(he.Face);
}
Assert.AreEqual(4, mesh.Faces.Count);
Assert.AreEqual(4, mesh.Vertices.Count);
}
public void Mesh_TestJoinFaces()
{
// We make two triangles, and join the middle edge
//
// v1 o--------o v4
// | \ |
// | \ f2 |
// | \ |
// | \ |
// | f1 \ |
// | \ |
// | \|
// v2 o--------o v3
var vt1 = "v1";
var vt2 = "v2";
var vt3 = "v3";
var vt4 = "v4";
var vt5 = "v5";
var vt6 = "v6";
var vt7 = "v7";
var vt8 = "v8";
var mesh = new StringMesh();
StringMesh.Face f1 = mesh.CreateTriangle(vt1, vt2, vt3);
StringMesh.Vertex v1 = f1.Vertices.First(v => v.Traits == vt1);
StringMesh.Vertex v3 = f1.Vertices.First(v => v.Traits == vt3);
StringMesh.Face f2 = mesh.CreateTriangle(v1, v3, vt4);
Assert.AreEqual(2, mesh.Faces.Count);
Assert.AreEqual(5, mesh.Edges.Count);
Assert.AreEqual(4, mesh.Vertices.Count);
mesh.JoinFaces(v3.HalfedgeTo(v1));
Assert.AreEqual(1, mesh.Faces.Count);
Assert.AreEqual(4, mesh.Edges.Count);
Assert.AreEqual(4, mesh.Vertices.Count);
}