Why is the rescue bird placing my kart upside down?

[ReverendStickle]

Hello, sorry if this is the wrong place to ask. I am making an addon track for STK and I did not use the standard method for modeling the track but I think it should work anyway. For whatever reason though, when the bird rescues my kart it puts me upside down on the underside of my driveline. I've tried applying transforms and reversing the vertex order for both the track and the driveline, but it didn't work. I also tried deleting all the "fluff" from the track and leaving only the platform the kart drives on and I still had the problem. Also, in the sections of the track that have a ceiling over them the bird places me on the ceiling. I am new to blender and the track making process so any help would be appreciated if you know what might cause the bird to place my kart upside down.

[Sven]

Hi, this is absolutely the right place to ask!

It's really hard to guess what the issue might be, it would be best if you could send a screenshot of your .blend with the whole driveline visible.

That will make it easier to trace down the issue.

Cheers Sven

[ReverendStickle]

Hi, this is absolutely the right place to ask!

It's really hard to guess what the issue might be, it would be best if you could send a screenshot of your .blend with the whole driveline visible.

That will make it easier to trace down the issue.

Cheers Sven

Hi, thank you for the response! It was a little hard to get a good angle because of the unique nature of this track (sadly I cannot take credit for making the 3D model, I am just porting it to supertuxkart) but here are some pictures. There is one very long quad in the driveline because this is a point-to-point track in it's current state and I have not yet implemented a way to return to the top of the track, so I just connected the start and finish with one giant quad so it would export from blender properly. Splitting it up or curving it did not fix the problem sadly. Since the track is very large, I also have two screenshots of the start of the track showing the driveline and the track mesh. I hope these help, thanks again.

[Sven]

Your last picture shows it pretty clearly.
It's the big quad that is causing the issue, basically you created a möbius strip.

That's why the game struggles to understand which side is facing up and which is facing down.

You could either add a curve in the top right before connecting it to the the bottom part or you could simply switch the edges of the long quad.

I hope that was understandable, if you have further questions let me know

[ReverendStickle]

Thanks a lot, that finally fixed it and I feel bad for not realizing that. Thank you for spending some of your valuable time helping a noob like me!