π¨ NOTICE: This project is now unmaintained, for lack of a reliable Recast WASM build. See #48 for details.
A plugin for the A-Frame Inspector, allowing creation of a navigation mesh while from an existing A-Frame scene. This plugin should not be used at runtime in the live scene, but only during scene creation.
Kitchen v2 by Jerad Bitner, on Google Poly.
A navigation mesh helps AI agents navigate, and is one way of constraining first-person controls and VR teleportation within a playable area. For information about using a navigation mesh in A-Frame, see Pathfinding documentation in A-Frame Extras.
<script src="https://recast-api.donmccurdy.com/aframe-inspector-plugin-recast.js"></script>
<a-scene inspector-plugin-recast> ...
Configure settings if needed, and press Build.
Close the inspector and test the navigation mesh, either using the usual instructions or the included nav-debug-pointer
component.
If things are working properly, use the Export button to save your finished navigation mesh as a .gltf
file.
Load the navigation mesh into your finished scene with the documentation in A-Frame Extras.
property | default | description |
---|---|---|
cellSize | 0.3 | Width/depth of voxel cells used to sample scene geometry. 0.05 β 3. |
cellHeight | 0.2 | Height of voxel cells used to sample scene geometry. 0.1 β 3. |
agentHeight | 1.6 | Minimum floor to 'ceiling' height that will still allow the floor area to be considered walkable. Permits detection of overhangs in the source geometry that make the geometry below un-walkable. The value is usually set to the maximum agent height. 0.1 β 3. |
agentRadius | 0.2 | The distance to erode/shrink the walkable area of the heightfield away from obstructions. In general, this is the closest any part of the final mesh should get to an obstruction in the source geometry. It is usually set to the maximum agent radius. Areas too narrow will be considered "blocked." 0.1 β 3. |
agentMaxClimb | 0.5 | Maximum ledge height that is considered to still be traversable. Allows the mesh to flow over low lying obstructions such as curbs and up/down stairways. The value is usually set to how far up/down an agent can step. 0.1 β 5. |
agentMaxSlope | 30 | The maximum slope that is considered walkable. 0 β 90. |
This plugin sends scene geometry temporarily to a remote API for processing, and imposes limits on the size of the processed scene for that reason. Suggestions for getting started:
<a-sky/>
, that are not intended for navigation, should be omitted while creating the mesh.selector
input.Improving results when something doesn't look right:
cellSize
to increase precision.agentHeight
determines when overhangs will block movement. agentRadius
determines how narrow a space is passable.agentMaxClimb
should be just greater than the largest stairsteps or curbs a character can walk over.If you need to create a navigation mesh for larger scenes, run the plugin's navmesh service locally after cloning this repository:
npm run dev
<a-scene inspector-plugin-recast="serviceURL: http://localhost:3000;"> ...
This plugin includes an additional component for teleporting around a navigation mesh, nav-debug-pointer
. It can be used alongside movement-controls
to test out the navigation mesh with FPS-style movement. The cursor will display in green while looking at the navigation mesh, red while looking away, and allows teleporting to any part of the navigation mesh. The movement-controls
component supports clamping player WASD movement within the mesh. AI pathfinding is described in further documentation.
<a-entity id="rig" movement-controls="constrainToNavMesh: true">
<a-entity camera
position="0 1.6 0"
look-controls>
<a-cursor nav-debug-pointer raycaster="objects: [nav-mesh];"></a-cursor>
</a-entity>
</a-entity>
Adjust settings as needed if the navigation mesh is not appropriate. Final adjustments (correcting distortions, or adding/removing connections to particular areas) can also be applied in any modeling tool.
Thanks to: