2012

Table Of Contents
If the status is changed to Approved, Clash Detective takes the user currently logged on
as the person who approved it.
Enabling hyperlinks will show clash results using the relevant status icon .
clash test status A clash test can have one of 4 statuses:
New indicates a clash test that has not yet been run with the current model.
Done indicates a clash test that has been successfully run with the latest version of the
model.
Old indicates a clash test that has been altered in some way since being set up. This might
include changing an option, or having loaded the latest revision of the model.
NOTE Individual clash statuses can still be edited in a clash test with a status of Old.
Partial indicates a clash test that has been interrupted during execution. Results are available
up to the point of interruption.
clearance clash A clash in which the geometry of item 1 may or may not intersect that of
item 2, but comes within a distance of less than the set tolerance (page 839).
duplicate clash A clash in which the geometry of item 1 is the same as that of item 2,
located within a distance of between zero and the set
tolerance (page 839). A tolerance of
zero would therefore only detect duplicate geometry in exactly the same location.
hard clash A clash in which the geometry of item 1 intersects that of item 2 by a distance
of more than the set
tolerance (page 839).
intersection method A standard Hard clash test type applies a Normal Intersection
Method, which sets the clash test to check for intersections between any of the triangles
defining the two items being tested (remember all Autodesk Navisworks geometry is
composed of triangles). This may miss clashes between items where none of the triangles
intersect. For example, two pipes that are exactly parallel and overlap each other slightly at
their ends. The pipes intersect, yet none of the triangles that define their geometry do and
so this clash would be missed using the standard Hard clash test type. However, choosing
Hard (Conservative) reports all pairs of items, which might clash. This may give false
positives in the results, but it is a more thorough and safer clash detection method.
severity For hard clashes, the severity of a clash depends on the intersection of the two
items intersecting. Hard clashes are recorded as a negative distance. The more negative the
distance, the more severe the clash. Hard clash severity depends on whether the
Conservative or NormalIntersection Method has been applied (see
intersection
method
(page 838) for more details on this). If Normal, the greatest penetration between a
pair of triangles is measured. If Conservative, the greatest penetration of space around
one item into the space around another is measured.
838 | Chapter 18 Glossary