添加项目文件。

DotNet.Exchange.Revit/Export/TriangleFaceNode.cs

@@ -0,0 +1,23 @@
+using Autodesk.Revit.DB;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DotNet.Exchange.Revit.Export
+{
+    public sealed class TriangleFaceNode
+    {
+        internal TriangleFaceNode(int v1, int v2, int v3)
+        {
+            this.V1 = (int)v1;
+            this.V2 = (int)v2;
+            this.V3 = (int)v3;
+        }
+
+        public int V1 { get; private set; }
+        public int V2 { get; private set; }
+        public int V3 { get; private set; }
+    }
+}