Layered Grid - Handling multiple layers on single mesh collider

General Grid graph
1

Hello! Hopefully this is the correct place to ask a question. I am trying to use a layered grid graph to handle multiple layers and it work great as long as the different layers are caused by different collision meshes. When I have a single collision mesh with multiple levels, however, the ray only returns a single collision. What would be the best way to go about addressing this (the mesh is procedural and decimating isn’t really an option at this point).

Thanks!

2

Looks like this is already known:

		/// <summary>
		/// Returns all hits when checking height for position.
		/// Warning: Does not work well with thick raycast, will only return an object a single time
		///
		/// Warning: The returned array is ephermal. It will be invalidated when this method is called again.
		/// If you need persistent results you should copy it.
		///
		/// The returned array may be larger than the actual number of hits, the numHits out parameter indicates how many hits there actually were.
		/// </summary>

Going to try porting this over to RaycastAll

3

Well, it looks like it already uses Physics.RaycastNonAlloc which should return multiple results ala Physics.RaycastAll…

Back to the drawing board.

4

Hi

Are you sure you are not using thick raycasting in the grid graph settings? That mode can in some cases cause this behavior I think.

5

Hi Aron,

I am not using thick raycasting. Enabling that option with Layered Graph gives a warning.

https://imgur.com/gallery/OrU0O6l

The plane on the left is a different mesh and both the top and bottom are detected by the A*. The cubes on the left are a combined mesh with the terrain below and only the top is detected by A* (Minecraft-esque voxels).

6

Old post but I had the same issue and fixed here: