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Shared Vertices for Multiple Resolutions?

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I am sharing vertices and normals for multiple triangle configurations / resolutions.  I am running into some strange shading inconsistencies that I do not understand and suspect that I may lack some pertinent background knowledge on vertex buffers and how they behave.  In general is it bad practice to reuse the same vertex data including normals for multiple triangle configurations?  Could this potentially cause problems?  I am using one vertex buffer to store all the vertices of all resolutions, however the way the vertices are arranged triangles could conceivably be comprised of vertices at opposite ends of the vertex buffer, could this lead to problems?

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