They did, and it still exists, but only ever rendered to SD, so it's nowhere near detailed enough for any further work.
Which is ridiculous, because there is a full HD CG model used in a YouTube video that looks better than any thing in any version of TMP. Look up a video called "Star Trek- A Space Odyssey". EDIT: Here it is: https://www.youtube.com/watch?v=gvPrYMczF3k&feature=youtube_gdata_player It's a full HD recreation of the space dock scene from early in the film from the initial shuttle pod approach and fly around, to clearing moorings and departure to a flight through the solar system past Jupiter and then a jump to Warp. Point being, is that using this model, they could recreate every exterior scene in the film.
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