So I've been working on this really amazing project for Build-It and I was getting to the tunnels. They are really messed up, even though there is no funky banking. I have no idea what is happening. Does anybody know how to fix this?

   
   

looks like a texture issue or something... no clue how to fix stuff like that though

Try putting roll vertexes along the enterance to the tunnel. That might work. If it does not, it looks pretty cool as it is. Also try removing the tunnel and then replacing it, or perhaps just re-freezing the coaster would work.

Try removing the supports closest to the tunnel entrance. I have seen supports interfere with the tunnel draw.

This is a thread from several months ago, so this question has already been addressed.