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OpenGL How to turn triangles from isosurface into smooth surfaces?

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Hi, I have been able to generate triangles from an isosurface algorithm, and the triangles can be displayed correctly, with color filled inside each triangle. The problem is that I don't know how to turn the triangles into a smooth surface, for example, like the shapes of a human head. Can somebody tell me what I need to do to achieve that? Thanks a lot. BTW, I am pretty new to 3D programming and I just ported the isosurface algo, and I am using OpenGL. Thanks. PS. If you go to http://nysb.photosite.com/, you will see what I currently have. Thanks a lot.

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