I restored the "hexagoniness" of the terrain mesh in my #bevyengine game using a custom fragment shader:
Calculate distance from fragment to nearest hexagon edge, using the fragment's world position.
Highlight the fragment if that distance is small.
I added 
terrain heights to my game. I like how it feels more immersive than a flat world. 
The triangle mesh makes it look less "hexagony" but I think I can fix that by adjusting the materials. 
I've published an interactive blog post on building agent behaviour with Bevy Behave!
Play around with a Bevy app inside the blog post.
Learn how to build behaviour trees with Bevy Behave.
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Make the agents earn points and eat tasty fruit!
