navmesh
Armory is designed to work with any navigation engine. Internally, a glue code is written which binds the engine. By default, Armory is configured to use Recast navigation.
If no navmesh is detected in the scene, Armory skips including the navmesh module to save space and performance. To force including the module, set Armory Project - Modules - Navigation from Auto to Enabled.
Adding a navmesh is as simple as: selecting an object, going the Object tab, and then in Armory Traits click + to add a new trait, select Bundled, and then in class pick the "Navmesh".
To generate a navmesh representation, you can click Generate Navmesh.
You can modify the settings to affect the navmesh generation for the visualization and the in-game version.
Be aware that if your object is too small, the recast library might not be able to process it for the simulation.
Examples: