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In Plan view, the openings are represented by the 2D block.
If you assign the 3D block a material such as glass (in the 3D page of its Properties), and assign a brick material for the walls, you can see the results in render mode.
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In Plan view, the openings are represented by the 2D block.
If you assign the 3D block a material such as glass (in the 3D page of its Properties), and assign a brick material for the walls, you can see the results in render mode.