XNA how to pick up the triangle face a very practical example of the procedure

TrianglePickingSample
.....................\Microsoft Permissive License.rtf
.....................\TrianglePicking.htm
.....................\TrianglePickingPipeline
.....................\.......................\Properties
.....................\.......................\..........\AssemblyInfo.cs
.....................\.......................\TrianglePickingPipeline.csproj
.....................\.......................\TrianglePickingProcessor.cs
.....................\TrianglePickingSample
.....................\.....................\Content
.....................\.....................\.......\Arial 14.spritefont
.....................\.....................\.......\cat.tga
.....................\.....................\.......\Cats.fbx
.....................\.....................\.......\Content.contentproj
.....................\.....................\.......\cursor.png
.....................\.....................\.......\Cylinder.fbx
.....................\.....................\.......\P2Wedge.fbx
.....................\.....................\.......\Sphere.fbx
.....................\.....................\.......\table.FBX
.....................\.....................\.......\wedge_p2_diff_v1.tga
.....................\.....................\.......\wood.tga
.....................\.....................\Cursor.cs
.....................\.....................\Game.cs

.....................\.....................\Properties
.....................\.....................\..........\AssemblyInfo.cs

.....................\.....................\TrianglePickingWindows.csproj
.....................\.....................\TrianglePickingXBox.csproj
.....................\TrianglePickingWindows.sln
.....................\TrianglePickingXBox.sln

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