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Polygon Class + VBO/DL == Moot?

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I'm working on a polygon class which is an extension of NeHe Article 07 http://nehe.gamedev.net/data/articles/article.asp?article=07 But I'm thinking, why would I store mesh data in a class that's likely to be stored in System Memory when I plan to dump the vertices into a Vertex Buffer Object or Display List? On a side note, the code in the article does not compile, using the optimized rendering member function I get the following error: cannot convert `VERTEX*' to `const GLfloat*' for argument `1 for the line that says this: glVertex3fv(&m_pVertices[ptrIndex++->nVertex]);

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