Is there a way to outline a gridmap?

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:bust_in_silhouette: Asked By Spikmin

Creating an outline mesh for just one object is easy. Is there some way to create an outline mesh for a gridmap?
I’ve tried applying outline meshes to adjacent objects and what ends up happening is the outline of one object overlaps the other object instead of joining with the other outline mesh. The only way I’ve found to keep the outlines behind all the objects is to enable no_depth_test, but then they’re in front of EVERYTHING. Can’t go behind walls etc.
If anyone has any ideas for workarounds/solutions to this please post below!