Spline Mesh Tiling repeats onto itself after hitting vertex limit

[Lasercar]

When a repeating spline mesh tiling is extended to a long distance, it breaks and repeats onto itself.
I've checked and no one else has reported this. I'm using Unity 2020.3.14f1.

[methusalah]

I think this happens when the generated mesh get more than 65535 vertices. Can you check that and report back?

[Lasercar]

Yep, the MeshBlender mesh has more than 65535 vertices.

[methusalah]

In general, creating such a big mesh is bad design. In your example, the rail road will be drawn entirely each frame, even if only 1% of it is in the camera field. I would suggest creating a script that will only build the track out of a certain number of curve or a certain distance, to prevent reaching the mesh vertex limit and enable frustrum culling.

As for going past the limit, I think it is possible to ask Unity to manage meshes with more vertices but I never tried it. It should also be possible to change the MeshBender code to create a new mesh when the limit is reached, but this will require some code refactor, and you would need to manage the normal smoothing where the two mesh connect.

[Lasercar]

Ok. Not sure where to start for all of that though.