Modify wind pressure coefficients
In order to change the wind pressure coefficients generated by the 3D wind generator for a specific element/load panel, you should firstly select the wind data associated to the element/panel in object, thus click on 'edit zones'.
![EditZones](/sites/default/files/styles/embed_large/public/images/2022-03/EditZones.png?itok=6yynJuEK)
At this point the zone editor window appears. By means of this it is possible to edit both the zones geometry as well as the associated pressure coefficients:
![ZonesEditor](/sites/default/files/styles/embed_medium/public/images/2022-03/ZonesEditor.png?itok=Nlgy7vIP)
To modify zone and/or pressure coefficients you should switch from 'Generate' to 'Manual design' or in alternative to 'Template according to EC-EN':
- the “manual design” option allows you to draw from scratch the wind zones;
- the “template according to EC-EN” option allows you to operate on a template of zones based on Eurocode.
With both options you should set the pressure coefficients manually, zone by zone.
![Design](/sites/default/files/styles/embed_medium/public/images/2022-03/Design.png?itok=_wnt9MRX)
To create new zones: the “divide” command allows you to create new zones by vertically/horizontally dividing already existing zones:
![Divide](/sites/default/files/styles/embed_medium/public/images/2022-03/Divide.png?itok=yR8M12k-)
To delete existing zones: the “join” command allows you to remove existing zones by merging them with other zones
Finally, the pressure coefficients can be manually input for each zone in the dedicated window:
![Values](/sites/default/files/styles/embed_medium/public/images/2022-03/Values.png?itok=bca6UsXO)