Create navmeshes in DMT

1. In DMT beta, click on "My domains" and select your domain.
2. Click the "Edit or create navmesh" tile.
3. Scan one of the portals to calibrate into the domain.
4. Tap on a walkable area of the floor to create the first navmesh. Drag either the corners or the sides to adjust the navmesh.
5. Repeat step 4 until all walkable areas are covered, making sure that navmeshes overlap at intersections.
6. Click "Finish setup" when you're done.
7. You can now view the navmeshes in either 3D view ("Explore domain 3D" tile) or AR view ("Explore domain AR" tile).

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