You can create a new obstruction in the 2D section of the Site Model of a project. Click on the Add Obstruction button in the right hand tool bar then select the shape you want to model: a Polygon, a Rectangle, or a Polygon. Chimneys are typically best represented by rectangular obstructions, skylights and vents by circular obstructions and AC ducts or parapets by polygonal obstructions.
Once you have selected the obstruction shape, you can place the obstruction by clicking and dragging (in the case of rectangular and circular obstructions), or by clicking to place the nodes of a polygonal obstruction (you will have to click on a node to close the shape once you are done defining your polygon).
Note that you can define a setback for obstructions to make sure that no solar panels get placed to close to an obstruction.
After defining the obstruction in 2D, you can continue modeling in 3D mode in the top left corner of the project.
Clicking on it will open the inspector, which allows you to set two properties:
- Height: The hight of the obstruction relative to its lowest point of contact with the roof.
- Flush: Defines whether an obstruction is flush or not. Flush obstructions have no height and do not cast any shade. This option is typically appropriate for skylights or hatches.
Check out more about modeling obstructions here.