A simplified world of cubes could be very simple to render: blocks are solid color only; lighting is ambient light only. How quickly can a large number of such blocks be rendered? (This might be too simple; one will not be able to see the edges of cubes. Maybe we want textures, or at least different colors for different cube faces. Adding diffuse lighting would also not be difficult: there are only 6 normal vectors.)
As Minecraft demonstrated, sophisticated modeling and photorealistic lighting are not necessary for an enjoyable game. However, the ability to render large scenes is desirable, so keep things simple for performance.
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