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Compare two versions of a model
Open two versions of the same IFC model and see which elements were added, removed and changed, matched by their GlobalIds, with a CSV of every change.
Written for BimCraft 0.4. The same help is inside the app: press F1.
What you'll do
See what changed between the model you had and the one you were sent: which elements are new, which are gone, which moved or got new property values.
Steps
- Open the newer version, then click Add a model… and choose the older one. See See several IFC models together.
- In Models, open Compare versions.
- Choose the Older version and the Newer version.
- Click Compare.
- Click an element in a list to pick it and see its properties. Click Download CSV for every change, property by property.
- Click Clear to go back to the normal view.
What you should see
- Added elements in blue, from the newer version.
- Removed elements in red, from the older version.
- Changed elements in ochre, from the newer version, each saying what changed: properties, a move with how far, or a new shape.
- Everything that is the same, see-through.
Good to know
- Elements are matched by their GlobalId. A program that gives elements new GlobalIds on every export makes every element look removed and added again.
- Positions are compared where the models sit in the scene. If one version was moved on purpose, line them up first with Move in Models.
- A GlobalId used twice in one model is left out of the comparison. Check a model for common problems finds those.