C# TriMesh.AppendToEdgeList方法代码示例

        private static void InsertEdge(TriMesh mesh, TriMesh.HalfEdge inner, TriMesh.HalfEdge outer)
        {
            //TriMesh.Edge left = new TriMesh.Edge();
            //left.HalfEdge0 = outer;
            //outer.Edge = left;
            //inner.Next.Edge = left;

            //TriMesh.Edge right = outer.Edge;
            //right.HalfEdge0 = inner;
            //inner.Edge = right;
            //outer.Opposite.Edge = right;

            //inner.Opposite = outer.Opposite;
            //inner.Next.Opposite = outer;
            //outer.Opposite.Opposite = inner;
            //outer.Opposite = inner.Next;
            inner.Opposite = outer.Opposite;
            inner.Next.Opposite = outer;
            outer.Opposite.Opposite = inner;
            outer.Opposite = inner.Next;
            outer.Edge.HalfEdge0 = outer;

            TriMesh.Edge edge = new TriMesh.Edge();
            edge.HalfEdge0 = inner;
            inner.Edge = edge;
            inner.Opposite.Edge = edge;
            inner.Next.Edge = outer.Edge;

            mesh.AppendToEdgeList(edge);
        }

        /// <summary>
        /// Adds a face to the mesh with the specified face traits.
        /// </summary>
        /// <param name="faceTraits">The custom traits for the face to add to the mesh.</param>
        /// <param name="faceVertices">The vertices of the face in counterclockwise order.</param>
        /// <returns>The face created by this method.</returns>
        /// <exception cref="BadTopologyException">
        /// Thrown when fewer than three vertices are given or the vertices cannot form a valid face.
        /// </exception>
        /// <exception cref="ArgumentNullException">Thrown when a null vertex is given.</exception>
        private static TriMesh.Face CreateFace(TriMesh mesh, params TriMesh.Vertex[] faceVertices)
        {
            int n = faceVertices.Length; 
            // Require at least 3 vertices
            if (n < 3)
            {
                throw new BadTopologyException("Cannot create a polygon with fewer than three vertices.");
            }  
            TriMesh.Edge e;
            TriMesh.Face f;
            TriMesh.HalfEdge[] faceHalfedges = new TriMesh.HalfEdge[n];
            bool[] isNewEdge = new bool[n], isUsedVertex = new bool[n]; 
            for (int i = 0; i < n; i++)
            {
                int j = (i + 1) % n; 
                faceHalfedges[i] = faceVertices[i].FindHalfedgeTo(faceVertices[j]);

            }

            // Make sure input is (mostly) acceptable before making any changes to the mesh
            for (int i = 0; i < n; ++i)
            {
                int j = (i + 1) % n; 
                if (faceVertices[i] == null)
                {
                    throw new ArgumentNullException("Can't add a null vertex to a face.");
                }
                if (!faceVertices[i].OnBoundary)
                { 
                    throw new BadTopologyException("Can't add an edge to a vertex on the interior of a mesh.");
                } 
                // Find existing halfedges for this face
                faceHalfedges[i] = faceVertices[i].FindHalfedgeTo(faceVertices[j]);
                isNewEdge[i] = (faceHalfedges[i] == null);
                isUsedVertex[i] = (faceVertices[i].HalfEdge != null); 
                if (!isNewEdge[i] && !faceHalfedges[i].OnBoundary)
                { 
                    throw new BadTopologyException("Can't add more than two faces to an edge.");
                }
            } 
            // Create face
            f = new TriMesh.Face(default(FaceTraits));
            mesh.AppendToFaceList(f); 
            // Create new edges
            for (int i = 0; i < n; ++i)
            {
                int j = (i + 1) % n; 
                if (isNewEdge[i])
                {
                    // Create new edge
                    e = new TriMesh.Edge();
                    mesh.AppendToEdgeList(e); 
                    // Create new halfedges
                    faceHalfedges[i] = new TriMesh.HalfEdge();
                    mesh.AppendToHalfedgeList(faceHalfedges[i]); 
                    faceHalfedges[i].Opposite = new TriMesh.HalfEdge();
                    mesh.AppendToHalfedgeList(faceHalfedges[i].Opposite); 
                    // Connect opposite halfedge to inner halfedge
                    faceHalfedges[i].Opposite.Opposite = faceHalfedges[i]; 
                    // Connect edge to halfedges
                    e.HalfEdge0 = faceHalfedges[i]; 
                    // Connect halfedges to edge
                    faceHalfedges[i].Edge = e;
                    faceHalfedges[i].Opposite.Edge = e; 
                    // Connect halfedges to vertices
                    faceHalfedges[i].ToVertex = faceVertices[j];
                    faceHalfedges[i].Opposite.ToVertex = faceVertices[i]; 
                    // Connect vertex to outgoing halfedge if it doesn't have one yet
                    if (faceVertices[i].HalfEdge == null)
                    {
                        faceVertices[i].HalfEdge = faceHalfedges[i];
                    }
                } 
                if (faceHalfedges[i].Face != null)
                {
                    throw new BadTopologyException("An inner halfedge already has a face assigned to it.");
                } 
                // Connect inner halfedge to face
                faceHalfedges[i].Face = f; 
            }

            // Connect next/previous halfedges
            for (int i = 0; i < n; ++i)
            {
                int j = (i + 1) % n;

                // Outer halfedges
                if (isNewEdge[i] && isNewEdge[j] && isUsedVertex[j])  // Both edges are new and vertex has faces connected already
                {
                    TriMesh.HalfEdge closeHalfedge = null; 
//.........这里部分代码省略.........