Priority-Based Element Intersections

Migrate from ARCHICAD 16 and earlier.

As of ARCHICAD 17, a greatly improved Intersection method allows the intersection priority within the Building Material to work among all construction elements - including single-skin, Composite and Profiled elements.

Migration Default: Your Intersections Are Preserved in “Legacy Mode”

When migrating from ARCHICAD 16 or earlier: the Legacy checkbox for element intersections is turned on by default to maintain the appearance of your model.

You will not see any changes in your element intersections

Some new features from subsequent ARCHICAD releases are not available

Note: When you create a new file from the template, this legacy checkbox is off by default and the new intersections method is enabled.

Legacy Mode is controlled in Options > Project Preferences > Legacy.

https://helpcenter.graphisoft.com/wp-content/uploads/archicad-24-reference-guide/011_migrationguideolderversions/LegacyIntersectionOn.png 

See Legacy Preferences.

How to Enable New Intersections in ARCHICAD 24 (Turn off Legacy Mode)

The new Intersection method can be enabled by turning off the “legacy intersection method” found under Project Preferences > Legacy.

After this legacy checkbox is turned off, your models’ intersections may appear different. It is advised to review the model, make necessary amendments to the model geometry and also check for previous workarounds that may no longer be necessary (for example 2D patching or SEO).

Existing intersections that do not involve geometric element collision will not clean up automatically. If you want automatic intersections to take effect for these, a number of features can assist you in achieving collisions, thereby allowing the automatic intersection logic to take effect.

See Tips for Better Intersections in Migrated Projects.

Any newly placed elements whose collisions are modeled using the new modeling methods will clean up according to the new logic.

Tips for Better Intersections in Migrated Projects

If you have migrated your project to ARCHICAD 24 and wish to use the new Intersections logic on your older-version model, see the following section for techniques and features to optimize your model intersections.

See How to Make Sure Elements Collide for Best Cleanup Results.

For more information, see also Element Intersections.

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