feature focus
Cross-Discipline
Figure 5- Clash Detective Results Tab
test can be run again to determine whether the changes have resolved the clash, and to also check that the change hasn’t resulted in a clash with another item.
Figure 3- Clash Detective tool using search sets
Figure 4- Clash Detective tool using exported .nwc files
all of the search sets we created in Step 3. The Select tab is where we define our clash test. You will see the tabs Standard, Compact and so on under each tree. Scroll these to the right and select the Sets tab (for both Left and Right). Perform the following steps: • In the left pane, select a search: Choose Ducts. • In the right pane, select a search: Choose Pipes. • Ensure Self-Intersect is un-ticked on both sides (we do not wish to detect clashes against itself). • The Run type should be set to Hard, looking for physical intersections between items on the left and items on the right. • The Tolerance should be set to 1mm to ignore any clashes found with interferences less than 1mm. • Click the Start button to perform the clash test. Related clashes will be found. • Now let’s review the results. • Click on the Results tab (see Figure 5). • Click on any of the clashes detected. You should be automatically zoomed into the clash area, • The clashing items are highlighted in red to signify that it is a newly found clash (there are other colors for clash management that we will not go into here). • The clash draws our attention to a pipe passing through a duct. Details of the clashing items are shown at the bottom of the Results tab making it easier to identify them. As part of the review process a decision has to be made whether to approve a clash or whether action needs to be taken. Navisworks provides tools to add comments and mark-up clash results which can be recorded and kept as part of an audit trail. They can also be passed back to the engineering teams to advise how best to reroute the ducting, for example. Once any changes to the original project files (and exports to .NWC) have been made, the clash fall_2009
Conclusion Obviously Navisworks is a great partner tool for Revit. Its ability to bring in data from many other sources to produce a single unified 3D model is a massive improvement over the disconnected way in which construction projects have been managed historically. It can be said that Autodesk Navisworks provides a group of tools that allow us to reap big benefits on multiple levels and create a single environment to aid 3D model design reviews. This collaboration will quickly help anticipate potentially expensive on-site problems and provide the project team with clear indications of the viability of the chosen construction methods and schedule. For a comprehensive tutorial on the Navisworks clash detective tool you may check the Youtube links mentioned below Clash Detection Part I: http://www.youtube.com/ watch?v=JZ0PcEt-o08 Clash Detection Part II: http://www.youtube.com/ watch?v=CdeCcOzuWcI Clash Detection Part III: http://www.youtube.com/ watch?v=BqyBeaUQNKg We also want to acknowledge Abhishek Tyagi for his help with preparing this article. Debasish karmakar is a young and enthusiastic architect based in New Delhi, India with 7 years of experience of working on global projects. Debasish is a firm proponent of BIM and heads the BIM revolution at OBELISK (www. obelisk.in), with which he has been associated ever since its incorporation in 2008. Debasish has been working on the Revit Platform since 2003 and has been instrumental in preparing implementation and training modules.
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