One of the frequent questiions was about setting the layer height for a roof. I use this: set the Layer Z of the roof layer to the same height as the layer Z of the floor supporting the roof.
Another question was about using the Model Setup command. I never use the Model Setup command. The main problem to watch out for is the roof height. The layer Z of the roof layer should be the same as the layer Z of the floor supporting the roof, but this dialog box shows the setting for the roof layer to the underside of the roof. This causes confusion every time you use this dialog box.
If you have a building with 3 floors and 2 roof heights, the model setup can not cope, so you still have to learn how to set up the layers correctly. If you learn how to set up the layers correctly, you don’t have to use the Model Setup, and you will get your layers faster.
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