How are painted navigable areas supposed to work? #826
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Hi all, Could someone explain how the painted navigable areas are meant to work? From the documentation, I expected that when baking the navmesh, it would only be generated in areas that have been painted purple. But as far as I can tell, it seems to make no difference, and the navmesh is generated everywhere (regardless of purple). What am I doing wrong? 
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Replies: 1 comment 5 replies
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Did you read our navigation documentation? Did you look at our navigation demo? When baked from our menu it only bakes the terrain navigation. How exactly are you baking? |
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Yes, I've been working from https://terrain3d.readthedocs.io/en/stable/docs/navigation.html. It says:
which I interpreted as meaning that areas not marked in purple would be excluded from the nav mesh. After baking, the light blue polygons of the nav mesh appear, but they don't correspond to the purple areas. Am I misunderstanding? I'm baking using the steps on that page (Terrain3D menu -> Bake NavMesh). I've tried using a manually set up NavigationRegion3D as well as one created by the Terrain3D -> Set up Navigation option, with the same result. |
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I think I've found something: I see the above behaviour when the Terrain3D collision mode is set to either "Full / Editor" or "Dynamic / Editor". It behaves the way I'd expect when using "Full / Game" or "Dynamic / Game". Is this intended behaviour? |
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If you have turned on editor collision on the terrain, and have set up your navigation region to respond to collision when baking, it will bake collision into the nav mesh. You can adjust the collision layers of your nav region to ignore the terrain if you want to keep collision enabled while baking. 
If you disable editor collision (default) and bake from the Terrain3D menu, it will only bake Terrain3D navigable areas. Here the demo area is too big for a single bake, so I have specified an AABB in the navigation region / navigation mesh. This is working fine. 
In order to use Godot's navigation system, you need to learn about all of its features, especially its navmesh capabilities. We don't control or calculate navigation. We only pass along the mesh data of the navigable area to Godot for it to generate its own navmesh. You can see here I have baked it properly using the NavigationDemo, and I added an AABB x 0, w1024, y -50, h200, z -2048, d 1024 to constrain the bake area. |
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Thanks for the explanation. So Terrain3D only passes the navigable areas to Godot for baking, but if the navmesh is also set to use collision then it will generate navigation in other areas too? That makes sense. (It's hard to tell from a user's perspective what is done by Terrain3D and what is done by Godot.) We do need editor collision so we'll use the navmesh collision layers to control this. Also thank you for Terrain3D! We really appreciate the work that's been done. |
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Godot will bake any collision it detects based on your settings. It will also bake the Terrain3D navigation area we pass it if you do the proper step for it. You can filter collision with layers, or just disable editor collision while you bake. |
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If you have turned on editor collision on the terrain, and have set up your navigation region to respond to collision when baking, it will bake collision into the nav mesh. You can adjust the collision layers of your nav region to ignore the terrain if you want to keep collision enabled while baking.
If you disable editor collision (default) and bake from the Terrain3D menu, it will only bake Terrain3D navigable areas. Here the demo area is too big for a single bake, so I have specified an AABB in the navigation region / navigation mesh. This is working fine.
In order to use Godot's navigation system, you need to learn about all of its features, especially its navmesh capabilities. We …