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is opened will be accompanied by a noticeable performance hit. This is however
only a one-time effect; once the host drawing and its associated xref drawings
have been and opened and saved with the current version, the performance
will be improved for all future sessions.
When I try to generate a 3D freeform space from my model, why do I get an
error message: Valid boundary not found?
The space generation mechanism may not be able to detect a valid space
boundary for any of the following reasons:
1. The boundary objects are not 100% closed
Double-check your model to verify that the objects are really enclosing the
space. There may be tiny, barely visible gaps between the designated boundary
objects in the building model.
For example, if an interior wall is auto-projected to a roof slab without ceiling,
and the interior wall extends only to the baseline and not to the outside of
the outside wall, the 3D freeform space cannot be generated. In such a case
you could create a ceiling under the roof slab, so that walls are projected to
the ceiling instead of the actual roof. Or you could extend the interior wall
all the way to the outside of the exterior wall. You could also place a sweep
on the wall to make the top of the wall flush with the sloping roof slab.
2. Objects intended as boundary objects are not valid for the 3D freeform
space generation
The boundary objects for an associative 3D freeform space must belong to the
objects listed under Valid Boundary Objects for Associative Spaces on page
2905. Any other AutoCAD Architecture objects, such as railings or 2D linework,
will not be recognized by the space generation. If your selection set includes
one of these objects, it will be filtered out, and the boundary set will be
considered not closed. To create a valid bounded space, substitute a valid
boundary object for the invalid one.
3. Edges of boundary objects touch, but do not overlap
When boundary objects like walls, slabs, and other 3D geometry just touch
each other but do not have any overlap, or when objects intersect only along
an edge (to form a line rather than a surface intersection), they are considered
open even though the corresponding real-world components would be closed.
In such cases, no 3D freeform space can be created. To fix this problem, extend
one of the objects just far enough to create an overlap.
Troubleshooting Associative Spaces | 2939
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