"Infinite" is the big problem here. You could have very, very big, but not ever infinite. You could play around with the Poser One Sided Square, and keep adding it to itself many times until you build up a huge ground plane. Export the finished OBJ to UVMapper to remap, save the new version and use it for your ground. I did something similar when I wanted a very high res plane for water ripples.

Coppula eam se non posit acceptera jocularum.

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