Navmesh should be more accurate on walkable terrain

[Jeff425]

Currently, if a heightmap has a large area that is considered traversable, the entire area will be turned into one region. Regardless of height differences that occur in that area. Large hills and valleys may exist in these areas, but if the slopes are not too steep, the hills/valleys will be put into 1 or 2 triangles in the navmesh. This can make the navmesh be very inaccurate if it deviates too much.

Below is an example where I had the max_traversable_slope_radians set to PI so the navmesh ended up creating large triangles through hills and valleys.

Suggestion: Allow a NavMeshSetting for limiting the difference between the highest point in a region and lowest point in a region, in order to force accuracy.

2023-07-12.15-07-48.mp4