iimplementing and testing custom exporter OnPolymesh method

RvtVa3c/RvtVa3c.csproj

@@ -61,6 +61,7 @@
     <Compile Include="App.cs" />
     <Compile Include="Command.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Util.cs" />
     <Compile Include="Va3cExportContext.cs" />
     <Compile Include="Va3cFace.cs" />
     <Compile Include="Va3cMaterial.cs" />

RvtVa3c/Util.cs

@@ -0,0 +1,30 @@
+using Autodesk.Revit.DB;
+using System;
+
+namespace RvtVa3c
+{
+  class Util
+  {
+    /// <summary>
+    /// Return a string for a real number
+    /// formatted to two decimal places.
+    /// </summary>
+    public static string RealString( double a )
+    {
+      return a.ToString( "0.##" );
+    }
+
+    /// <summary>
+    /// Return a string for an XYZ point
+    /// or vector with its coordinates
+    /// formatted to two decimal places.
+    /// </summary>
+    public static string PointString( XYZ p )
+    {
+      return string.Format( "({0},{1},{2})",
+        RealString( p.X ),
+        RealString( p.Y ),
+        RealString( p.Z ) );
+    }
+  }
+}