Click on 4 corners of any rectangle in the scene. Then choose how many times you want to extend that rectangle towards the top, right, bottom, and left. Press the Extend button to recompute the grid. Press the Save button when the grid looks good. Repeat as needed.
{{polygons3d.length}} tiles saved. Download | Link | Draft
Click the tiles {{ selectedName() }} the entrance.
Place the {{ selectedName() }} corner of your rectangle.
Click a button above to start.