@willy
you mean gta2
you mean gta
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so to your question..
a 2d in a 3d world??

if u are making a demo/just for fun or a commercial game..
2d look shi* in a 3d world..
mostly it is used for backgrounds or sites the player cant go..

like in "SHENMUE" for the dreamcast...
the tree´s where 2d but it where in a position the player would not see it from the side.
it is mostly used just to conserve space .

so i cant anwer your question
but i can tell a 3d with 2d that the player can see if he rotate ..
uhmm it will be so much work
and not just in programming also in painting..

thats why 2d is mostly used for backgrounds..

example :
a beisball game or tennis game
the (audiense/publicum?)well the people that are sitting and looking...
they are 2d just with max. 3-4 animation
cuz they just move the arms..

DaRk - aNgEl