Each clash has a current status associated with it and each status has a colored icon to identify them. This status is updated automatically by Clash Detective or can be manually overridden if desired. The statuses are as follows:

• New : a clash found for the first time in the current run of the test.

• Active : a clash found in a previous run of the test and not resolved.

• Approved : a clash previously found and approved by someone.

• Resolved : a clash found in a previous run of the test and not in the current run of the test. It is therefore assumed to be resolved.

• Old : any clash in an "old" test. The icons still have the code of the status from the previous run, but this is a reminder to say that the current test is old. See for a description of old tests.

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

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.

• Partial indicates a clash test that has been interrupted during execution. Results are available up to the point of interruption.

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

A clash in which the geometry of item 1 intersects that of item 2 by a distance of more than the set >tolerance

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. A tolerance of zero would therefore only detect duplicate geometry in exactly the same location.

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 JetStream 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.

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 Normal Intersection Method has been applied (see 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.

For clearance clashes, the severity depends on how close one item invades the distance required around the second. For example, an item coming within 3mm is more severe than an item coming within 5mm of the other.

For duplicate clashes, the severity depends on how close one item is to the other. When the distance between them is zero, it is more likely that this is duplicate geometry, where as items that are further apart are more likely to be different objects and therefore have a lesser severity.

The Tolerance controls the severity of the clashes reported and the ability to filter out negligible clashes, which can be assumed to be worked around on site. Tolerance is used for >Hard>Clearance and >Duplicate types of clash test. Any clash found that is within this tolerance will be reported, whereas clashes outside of this tolerance will be ignored. So for Hard clashes, a clash with a >severity of between zero and the tolerance value will be ignored, whereas for Clearance clashes, a clash with a >severity of more than the tolerance value will be ignored as it is further away than the distance required. Similarly, a Duplicate clash with a >severity of more than the tolerance value will be ignored as it is likely to be a seperate, yet identical piece of geometry.