/// <summary>
/// See CGALCSharp.Test/Meshes/HalfEdgeBased/Cross.png
/// </summary>
/// <returns></returns>
public static HBMesh <HBVertex, HBEdge, HBFace> CreateCross()
{
var mesh = new HBMesh <HBVertex, HBEdge, HBFace>();
mesh.Fill(5, 8, 0);
var E = mesh.Edges;
var V = mesh.Vertices;
V[0].Edge = E[1];
V[1].Edge = E[3];
V[2].Edge = E[5];
V[3].Edge = E[7];
V[4].Edge = E[0];
E[0].Set(V[4], null, null, E[7], E[1]);
E[1].Set(V[0], null, E[2], null, E[0]);
E[2].Set(V[4], null, null, E[1], E[3]);
E[3].Set(V[1], null, E[4], null, E[2]);
E[4].Set(V[4], null, null, E[3], E[5]);
E[5].Set(V[2], null, E[6], null, E[4]);
E[6].Set(V[4], null, null, E[5], E[7]);
E[7].Set(V[3], null, E[0], null, E[6]);
return(mesh);
}
public static HBMesh <HBVertex2f, HBEdge, HBFace> CreateTriangle(Vector2f A, Vector2f B, Vector2f C)
{
var mesh = new HBMesh <HBVertex2f, HBEdge, HBFace>();
mesh.Fill(3, 3, 1);
var E = mesh.Edges;
var V = mesh.Vertices;
var F = mesh.Faces;
F[0].Edge = E[0];
V[0].Edge = E[0];
V[1].Edge = E[1];
V[2].Edge = E[2];
V[0].Position = A;
V[1].Position = B;
V[2].Position = C;
E[0].Set(V[0], F[0], E[2], E[1], null);
E[1].Set(V[1], F[0], E[0], E[2], null);
E[2].Set(V[2], F[0], E[1], E[0], null);
return(mesh);
}
public void WeldVerticesNoEdges()
{
var mesh = new HBMesh <HBVertex2f, HBEdge, HBFace>();
HBVertex2f[] verts = new HBVertex2f[]
{
new HBVertex2f(new Vector2f(-1, 1)),
new HBVertex2f(new Vector2f(1, 1)),
new HBVertex2f(new Vector2f(1, -1)),
new HBVertex2f(new Vector2f(-1, -1)),
new HBVertex2f(new Vector2f(0, 0.1f)),
new HBVertex2f(new Vector2f(0, -0.1f))
};
mesh.Vertices.AddRange(verts);
HBWeldVertices.WeldVertices(mesh, 0.21f);
Assert.AreEqual(5, mesh.Vertices.Count);
Assert.IsTrue(mesh.Vertices.Contains(verts[0]));
Assert.IsTrue(mesh.Vertices.Contains(verts[1]));
Assert.IsTrue(mesh.Vertices.Contains(verts[2]));
Assert.IsTrue(mesh.Vertices.Contains(verts[3]));
Assert.IsTrue(mesh.Vertices.Contains(verts[4]) || mesh.Vertices.Contains(verts[5]));
}
/// <summary>
/// Create the lines to show the connections between faces
/// for a half edge based mesh.
/// </summary>
void CreateConnectionLines(HBMesh <HBVertex2f, HBEdge, HBFace> mesh)
{
linePositions = new List <Vector2f>();
lineIndices = new List <int>();
foreach (var face in mesh.Faces)
{
Vector2f center = Vector2f.Zero;
foreach (HBVertex2f v in face.Edge.EnumerateVertices())
{
center += v.Position;
}
center /= 3.0f;
foreach (var edge in face.Edge.EnumerateEdges())
{
if (edge.Opposite == null)
{
continue;
}
var neighbor = edge.Opposite.Face;
Vector2f c = Vector2f.Zero;
foreach (HBVertex2f v in neighbor.Edge.EnumerateVertices())
{
c += v.Position;
}
c /= 3.0f;
int count = linePositions.Count;
linePositions.Add(center);
linePositions.Add(c);
lineIndices.Add(count);
lineIndices.Add(count + 1);
}
}
}
public static HBMesh <HBVertex, HBEdge, HBFace> CreateTriangle()
{
var mesh = new HBMesh <HBVertex, HBEdge, HBFace>();
mesh.Fill(3, 3, 1);
var E = mesh.Edges;
var V = mesh.Vertices;
var F = mesh.Faces;
F[0].Edge = E[0];
V[0].Edge = E[0];
V[1].Edge = E[1];
V[2].Edge = E[2];
E[0].Set(V[0], F[0], E[2], E[1], null);
E[1].Set(V[1], F[0], E[0], E[2], null);
E[2].Set(V[2], F[0], E[1], E[0], null);
return(mesh);
}
/// <summary>
/// See CGALCSharp.Test/Meshes/HalfEdgeBased/SquareWithCenter.png
/// </summary>
/// <returns></returns>
public static HBMesh <HBVertex, HBEdge, HBFace> CreateSquareWithCenter()
{
var mesh = new HBMesh <HBVertex, HBEdge, HBFace>();
mesh.Fill(5, 12, 4);
var E = mesh.Edges;
var V = mesh.Vertices;
var F = mesh.Faces;
V[0].Edge = E[1];
V[1].Edge = E[3];
V[2].Edge = E[5];
V[3].Edge = E[7];
V[4].Edge = E[0];
F[0].Edge = E[8];
F[1].Edge = E[9];
F[2].Edge = E[10];
F[3].Edge = E[11];
E[0].Set(V[4], F[3], E[11], E[7], E[1]);
E[1].Set(V[0], F[0], E[2], E[8], E[0]);
E[2].Set(V[4], F[0], E[8], E[1], E[3]);
E[3].Set(V[1], F[1], E[4], E[9], E[2]);
E[4].Set(V[4], F[1], E[9], E[3], E[5]);
E[5].Set(V[2], F[2], E[6], E[10], E[4]);
E[6].Set(V[4], F[2], E[10], E[5], E[7]);
E[7].Set(V[3], F[3], E[0], E[11], E[6]);
E[8].Set(V[1], F[0], E[1], E[2], null);
E[9].Set(V[2], F[1], E[3], E[4], null);
E[10].Set(V[3], F[2], E[5], E[6], null);
E[11].Set(V[0], F[3], E[7], E[0], null);
return(mesh);
}
