Agent Won't Take the Shortest Route Between Points

I'm trying to set up a simple traffic system for my game where I have a bunch of empty gameobjects set up as waypoints for cars to follow. Most of the time it works but sometimes the cars will take strange curvy routes rather than go directly between the two points.

I'm using Unity's built in navigation system and have some screenshots below that I hope will illustrate the problem.

Anyone have any idea what is going on?

 

The navmesh system seems to have a number of bugs to be worked out.

You could try creating a separate navmesh for cars that exist exclusively on the roads. This could be restricted even more by separating the lanes.

 

Seems like a candidate for a bug report.

 

I was able to solve the problem by setting all the road meshes as navigation static. This results in a navmesh that is more finely detailed around the roads, so the root of the problem probably has something to do with the navmesh sectors being too "big" for proper pathfinding.

 

I had the same problem earlier. My workaround is:
1) Assign NavMeshModifier to streets with Override Area on


2) Select applicable Area Mask for your car.


3) Rebake your scene.

Although this worked, NavMesh PathFinding still has the problem to find the shortest path anyway.