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problem rendering (properly lighting) model with WPF

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I've made a model of a chess piece and exported to OBJ. I'm trying to load and render it in c# WPF and having some trouble with shading/lighting.


I have a white directional light and white ambient light. The chess piece is rendered with a black material.


The problem I am trying to solve is the lighting/shading. It does not seem to be working. Any suggestions? All I see is opaque black. However, when I open the same model in Open3dMod it looks perfect so I don't think the vertex normals are wrong.


Screen shot from my running code (shading wrong)...




Screen shot from open3dmod viewer (shaded correcty)...




I have attached my rendering code (code-behind and xml). I have also attached the model (obj format). Any suggestions to get the lighting and shading working in my code would be appreciated. I don't know what I am doing wrong here.






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