FAQ: Why do I get an error message when I try to generate a 2D or extruded 3D space?

The "Valid boundary not found" error message may display when you try to generate a 2D or extruded 3D space from your model.

The space generation mechanism may not be able to detect a valid space boundary for any of the following reasons:

Some objects are not boundary objects
Some objects that are needed to create a closed boundary for the space are either not valid boundary objects for spaces or their Bound Spaces property is set to No. To see all objects that are currently boundary objects for spaces, click Home tabInquiry panelShow Space Boundaries. If an object that is needed for the boundary does not display, it is either not a valid boundary object or its Bound Spaces property is set to No.
The Maximum gap size is smaller than some colinear gaps in your model
When you generate a 2D or extruded 3D space, you can define an allowed gap size between colinear boundary objects. If the colinear gaps in your model are larger than the allowed gap size, the model is considered not closed, and a space cannot be generated or might flow into an adjacent area. In that case, change the maximum gap size to a value greater than your largest colinear gaps.