From my point of view it's easier to deal with map data this way, but has anyone done something like what I'm describing before - generated some method of converting map data between projections (spherical or geodic or what have you) to game?
The other question is How much money do you want to spend? There are several plugins for ARCGis from Esri that might do you as well.
Also a fair number of 3d modeling/texturing programs will get you there as well.
The other question is how much math do you want to do?
My preference is a Icosahedral projection done up in Fractal Terrains , then if I want a spherical projection I can use the same file to kick out that as well.
Professionally I use a lot of Illustrator and ARCgis stuff, but most of my projects are large scale regional maps mostly using UTM projections as a baseline. Though occasionally I will work up composists from both aerial and satellite stereo pairs, but those tend to end up as fairly rough cartograms with only the specific requested data points/features getting any amount of detail, often they just illustrate the written report rather that the report illustrating the graphic.