Weird navmesh artefacts

[subGlitch]

I have weird navmesh artefacts. You can see them in the screenshot. I managed to fix them by adding a quad rotated (90, 0, 0) and referencing it in Use Mesh Prefab setting of the NavMeshSurface2d. I don't understand why this fixed the problem, but somehow it worked.

But for me this solution feels like just a workaround. I think there should be no artefacts in a first place.

P.S.: thanks you very much for such a great tool

[h8man]

Hi,

I see dotted line, and bake setting Default Area - Walkable.
So first NavMeshPlus creates huge box area as walkable, and than carves out unwalkable regions.
I assume that you sprite shape are not complete squares and have some gaps, and those gaps are not carved out.

You can override tile shape by "Use Mesh Prefab", as you do.
Or, if your world is in square tiles, enable "Override by Grid".
Or, better use this scenario https://github.com/h8man/NavMeshPlus/wiki/HOW-TO#baking-a-maze

Also, enable compress bounds, it will increase bake time, but also will delete excessive tiles.

[subGlitch]

I assume that you sprite shape are not complete squares and have some gaps, and those gas are not carved out.

But does it matter? Because I use ColliderType.Grid, not ColliderType.Sprite.

Oh! I've just managed to fix the problem! See my fix in the code below. This is part of NavMeshBuilder2d.CollectTileSources() method. I don't understand why it fixed the problem. It was just a lucky guess. I wonder what was the issue...

else //default to box
{
    var boxsrc = new NavMeshBuildSource();
    boxsrc.transform = Matrix4x4.TRS(Vector3.Scale(tilemap.GetCellCenterWorld(vec3int), builder.overrideVector) - tilemap.layoutGrid.cellGap, tilemap.transform.rotation, tilemap.transform.lossyScale) * tilemap.orientationMatrix * tilemap.GetTransformMatrix(vec3int);
    boxsrc.shape = NavMeshBuildSourceShape.Box;
    // boxsrc.size = size;                          // problem: NavMesh artefacts =(
    boxsrc.size = new Vector3( 1, 1, 0 );           // All good!
    boxsrc.area = area;
    sources.Add(boxsrc);
}

[h8man]

Hi,

Yes, it does matter if you bake Geometry https://github.com/h8man/NavMeshPlus/wiki/HOW-TO#used-geometry
NavMeshPlus does not tolerate tilemaps "ColliderType".
Unity have public API to get mesh form sprite, or mesh from collider, but not mesh from grid cell, or mesh from sprite physics shape. And we need that mesh.

As for code above, I assume there is a bug. If both "Override Grid" and "Use Mesh Prefab" are used, than "size" is overwritten and does not correspond to grid's cell size.
var size = new Vector3(tilemap.layoutGrid.cellSize.x, tilemap.layoutGrid.cellSize.y, 0);
and
if (builder.useMeshPrefab != null) { ... size = builder.useMeshPrefab.transform.localScale;

[subGlitch]

var size = new Vector3(tilemap.layoutGrid.cellSize.x, tilemap.layoutGrid.cellSize.y, 0);

Yep, this works! Thanks!