Create an Atrium

To create an atrium in a Multi-plane roof:

1.Select the Roof in the Floor Plan or the 3D window.

2.From the pivot polygon (not the contour polygon!), bring up the pet palette and choose the Subtract from Polygon command.

//helpcenter.graphisoft.com/wp-content/uploads/ac21_help/03-1-elements-virtual-building/SubtractAtrium.png 

3.Draw the atrium shape in the Roof.

4.View the result in 3D.

//helpcenter.graphisoft.com/wp-content/uploads/ac21_help/03-1-elements-virtual-building/Atrium3D.png 

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