Moto Racer (PC, 1997) help me give a meaning to vectors embedded in tracks

[theone_32]

Hi all,

I dumped the track data of this game, and interpreted most of the meshes, objects and animations.

There is a list of vectors in the first section of the TRK file which i cannot interpret. 

I guess they are some precalculated physics data like inertia, gravity, centrifugal force, but i am not sure and I might need some ideas/insights.

here's a TRK dumper, just run "python trkdumper.py ILE02.TRK > dump.txt".

Here's also a quick 3d viewer. use keys 1 to 8 do toggle vectors, mouse to rotate, zoom, wheel to change vector scale.

you can find a demo zip with two .TRK files, here: CD Demo no install needed.

Thank you very much!

 

trkdumper.py track_box.py

[shak-otay]

Hi,

nice going! Green vectors could represent centrifugal force, but for one curve it's for driving clockwise, in another for driving counter clockwise. And in some spots the green vectors are missing or simply wrong, imho.

(You could check for physical simulators, if any, for mass-bearing objects on curves.)

[VendorX]

It's a height of the track.

[theone_32]

On 9/6/2025 at 8:59 PM, shak-otay said:

Hi,

nice going! Green vectors could represent centrifugal force, but for one curve it's for driving clockwise, in another for driving counter clockwise. And in some spots the green vectors are missing or simply wrong, imho.

(You could check for physical simulators, if any, for mass-bearing objects on curves.)

thanks! i thought the same, UV3 and UV4 might be centrifugal force respectively for CW and CCW drive, but those random spikes made me think again.

On 9/8/2025 at 9:46 PM, VendorX said:

It's a height of the track.

You mean UV2? position vertices include Y component for height, so I thought UV2 might be something like gravity or vertical component of inertia. What is your interpretation of this vector?