2011

you the opportunity to resolve these while the project remains in the digital stage. The potential savings in time
and money are obvious. (Click View tab Workspace panel Windows drop-down Clash Detective.)
The best advice for defining clash tests is to search for clashes where you would expect to find them. Let Clash
Detective help you, not replace you. If you try searching the entire model for everything that touches something
else, you will be inundated with false positives items that are meant to touch. If, however, you define clash tests
based on your real-world experiences of where things go wrong, and dont fit on site, then Autodesk Navisworks
can help you find and resolve these quickly.
1 Mouse over the Clash Detective window and pin
it open.
2 The Select tab is where we define our clash test. There is a Left and a Right side, both containing an identical
copy of the Selection Tree.
3 Under the Left and a Right sides, you will see the tabs Standard, Compact, and so on. Scroll these to the
right and select the Sets tab (for both Left and Right). Here you can see all of the search sets we imported
earlier.
4 In the Left tree, select Supply Air System.
5 In the Right tree, select Structural Framing Steel.
6 Ensure Self Intersect is unchecked on both sides (as we do not wish to clash check each side against itself).
7 The Run Type should be set to Hard, looking for physical intersections between items on the left and items
on the right.
8 The Tolerance (m) should be set to 0.001; therefore, we will ignore any clashes found with interferences
less than 1 mm.
9 In the Clash Detective window, click Start to perform the clash test.
Five clashes should be found. Now lets review these results:
10 Go to the Results tab and click Clash 3.
11 You will be automatically zoomed into the clash area, however, you may not have a clear view or you may
have objects (like the ceiling) obscuring your view. Use the Orbit tool to move around the clashing objects
to find a preferred viewpoint. In the Display group, select the Dim Other option to gray out all other objects,
20 | Chapter 1 Getting Started