Just a thought...
Could you do this with a two-pass render ?
First render the full scene, with tunnel seen from above. Then render just the vehicle with a suitable (circular ?) section of track just below it... You could probably get away with texturing a quad and then rotating it to get different directions. {Maybe even an animated texture to get in-tunnel movement ??}
... I am assuming a top-down 'SpyHunter' style game, so apologies if this is way off base !
Could you do this with a two-pass render ?
First render the full scene, with tunnel seen from above. Then render just the vehicle with a suitable (circular ?) section of track just below it... You could probably get away with texturing a quad and then rotating it to get different directions. {Maybe even an animated texture to get in-tunnel movement ??}
... I am assuming a top-down 'SpyHunter' style game, so apologies if this is way off base !