Recomputation

Recomputation is an administrator configuration task that becomes necessary when the values of significant attributes in the 3D model have been changed, for example, if discipline codes are changed. This is because these changes to the 3D model are not automatically communicated back to the Clash Manager, unless the relevant clash sets are rerun, or the recomputation process is initiated at these windows.

• Evaluate Element Properties

• Evaluate Clash Properties.

The changes to the 3D model can have been made independently in the base product, or in Clash Manager at the Clash Manager Configuration window. Following changes made in the base product, the recomputation windows must be accessed manually. When significant items are modified at the Clash Manager Configuration window, the recomputation windows are displayed automatically with the appropriate default entries in the relevant options. Examples of the changes that cause automatic display of the window are:

• rules added or deleted

• regular expressions modified

• defaults changed

• defined attributes changed.

When the recomputation process is performed, it is usually necessary to preserve the current approval status, in spite of any change in Acceptance Rules that would subsequently lead to different results. Also, it should be noted that rules are applied only when a clash is initially discovered; subsequent manual settings of attributes usually need to be preserved. Clash acceptance can be excluded from the process, as can any other aspects, by appropriate entries at this window.