Well, i do it Direct3D not A6... but the basic idea is, you make 6 views each with 90 degrees fov, and place the view position at the position of your car entity, and each facing the appropriate angle. then grab the view bitmaps, then make a cubemap. However, this would be very slow using the A6 render to texture commands, you would have to do it in D3D to get a decent speed...because A6 dosent let you render to a seperate face of a cubemap, and so assembling a cubemap every frame from 6 bitmaps is bound to be too slow.
So unless you want to write a dll, I suggest forgetting this method for now (until A6 has some built-in support for rendering to cubemaps).
Your best best is some kind of animated environment mapping to fake the reflections. you could actually hack it so you just render one view, and map this using spherical environment mapping onto the car.. this wouldnt have correct reflections, but it wouldnt be too noticeable.
