How to perform a clash detection with BIMcollab Zoom

How to perform a clash detection with BIMcollab Zoom

BIMcollab Zoom users who have a Zoom license, so not in BIMcollab Zoom Viewer, can perform clash detection within the loaded set of models.

Do you want to advance your knowledge about this subject? Go to ourBIMcollab Academy and enroll in the BIMcollab Zoom Clash detection course.

Setup a clash rule

Follow these steps to create a clash rule:
  1. Start BIMcollab Zoom with a Zoom license
  2. Connect to a project on BIMcollab Nexus or load a set of models manually
  3. Select the Conflicts panel
  4. All clash rules must be added to a clash rule set.
    Expand 'Local' or 'Shared' and select an existing set. If no clash rule set is present yet, create a new one by clicking the [+] button, or right clicking on 'Local' or 'Shared' and choosing 'Add clash rule set'.
    It will be automatically selected once created

  5. Click the [+] button again to start creating a new clash rule, or right click the clash rule set and choose 'Add clash rule'

  6. While creating a new clash rule you can edit the following fields:
    1. Name
      Give your rule a clear and unique name. The name can later be appended to issue titles to make them better searchable in BIMcollab.
    2. Source set
      Define a set of components which will be used as your source set by filtering them out by defining rules. Each rule exists of:
      1. An Element type you want top add to the set (e.g. walls, doors, columns)
      2. A Property, Operator and Value to be used to filter out elements with a specific property value
      3. The action which defines if the elements found should be added or removed from the set
      Test your set by clicking on the Show selected set button . The result will be shown in the 3D view
    3. Target set
      Define a set of components which will be used as your target set the same way as with the source set.
    4. Type
      Determine if you want to check for Clashes, Duplicates or both
    5. Tolerances
      Override the default tolerances in regard to clash box size, volume or both.
    6. Include clashes from a single:
      Define if the clash result may contain clashes of which the clashing elements are found within the same model, system or component.
    7. Description
      Provide the clash rule with a clear description so it's purpose is easily identifiable

7. Click OK to save the clash rule
8. Execute the clash rule (set)
  1. Double-click or use the Run button to execute a selected rule (set)
  2. Right-click to run on components in My view

9.The results of the clash test can then be found in the results panel.
The shared conflicts includes both Clash rules for clash detection and IDS specification for property validation.


By default, clashes are grouped together by source component, the nearest grid position, and the story level. To change this click 'Change grouping settings' .
In addition to the default options, one property can be chosen.
The name of the clash group will be structured as follows: Component (1), property (2), nearest grid (3), story level (4).

View modes

By default clashes are displayed using the schematic mode. The user can choose between a number of view modes which determines how the issue is displayed, by clicking the 'Change clash view mode' button .
Three view modes are available:
  1. Regular: Display the two clashing components
  2. Selected: Display the two clashing components and select them
  3. Schematic: Display the two clashing components transparent and highlight the clashing area
Additionally, you have the option to place a section box around the clashing components. This can be useful when recreating an issue within a modeling application.

Generating Issues

Issues can be generated from the results of the clash test in different ways, depending on if you are connected to a project or not.

When connected to a project on BIMcollab Nexus

When you are connected to a project on BIMcollab Nexus, you can report clashes to Smart issues to easily track the status of the reported clashes.
To learn more about this workflow, consult the article Create Smart issues by reporting Clash results.
Make sure you are connected to the correct BIMcollab space and project before generating the issues.

In offline mode

Select one or more results in the list
Click 'Batch generate issues'

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