Get relativ curtain wall bounding box

[stmeyerMHRM4]

I want to determine the detailed geometry (mullions / transoms) of a facade using the API. When I get the BoundingBox of the facade, it is in the world coordinate system and not relative. A mathematical conversion is easy for straight aligned facades. However, if the facade is diagonally oriented, it is not possible to determine the correct relativ BoundingBox. Hence my question, can a relative BoundingBox be queried directly?

[jeremy_tammik · Accepted solution]

You can retrieve the detailed curtain wall geometry, extract all its vertices, and create a convex hull from them:

• https://thebuildingcoder.typepad.com/blog/2010/05/curtain-wall-geometry.html
• https://thebuildingcoder.typepad.com/blog/2009/06/convex-hull-and-volume-computation.html