mirror tracks

[ctkatz]

we've seen successful conversions of many tracks to have them run in reverse, detroit and laguna being the two that immediately spring to mind. but something i haven't seen is a mirror track, such as racing at watkins glen, but instead of going down the hill and turning right for turn 1, you go down the hill and turn left. has anyone tried to make a mirror track?

[Pavel 69]

To make reverse track is bit easier I think. In 3do file track sections should be reordered in the bottom list of the 3do and distance values in DATA and DYNO functions need to be recalculated. And then track sections in trk file need to be reordered and adjusted.
But to make mirror track is much more complex task. For example you have to multiply all Y values by *(-1) for all vertices, adjus plane definitions in all BSP functions (I can't tell if only one of A, B, C coefficients need to be multiply by -1). Then all rotation values for objects need to be adjusted  to something like 360 - Zrot. So it's too many things to do. I think it can be easier to force your monitor to mirror output picture

[Wolf_pd]

I think there was even some total that could change a track by reversing the height parameters. I think it was done to Mid Ohio.