Color per vertex data (CPV) is commonly applied to 3D models that are created for interactive video games to more efficiently simulate shading and lighting effects. You can view this additional polygon color data applied to your polygonal models in the Maya scene to get an approximation of how they will appear when viewed on the game console.
The following illustration shows the difference made on a tower that has prelighting applied and green color-per-vertex near the base. The rock in the foreground has no prelighting, so it loses all shading and highlights.
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