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Prefabs#548670
<cat>Hammer.Advanced</cat>⤶
<title>Prefabs</title>⤶
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# What are prefabs?⤶
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A prefab is a collection of models, entities, or both organized into a single object that is saved out into a separate VMAP file. ⤶
It's similar to a group that can be moved around as one but different as it is treated as a single object in the map.⤶
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If the prefab is altered it should be saved to its current prefab VMAP file. ⤶
All other maps using this prefab will be updated (they will require recompiling as the change is not populated until the map with the updated prefab is loaded)⤶
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# Creating Prefabs⤶
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1. Select a number of objects and/or meshes⤶
<upload src="b0065/8dafa3d3990f678.png" size="399799" name="selectionbox.png" />⤶
2. Right click to bring up the context menu and `Selected Objects` -> `New Prefab From Selection (Center on Origin)`⤶
<upload src="b0065/8dafa3dc5f06809.png" size="446874" name="createprefaborigin.png" />⤶
3. This will create the prefab and ask to save a new VMAP⤶
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4. Choose an appropriate name and save the VMAP⤶
<upload src="b0065/8dafa3dda9644a4.png" size="4755" name="savingvmap.png" />⤶
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5. The prefab is now live in the world⤶
<upload src="b0065/8dafa3e356e7ab2.png" size="447977" name="liveprefab.png" />⤶
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## Editing Prefabs⤶
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You can edit prefabs inside the map you're working on. Just **double-click** on the **prefab** you want to edit. Any changes you make to that prefab will propagate in every instance of that prefab that was placed on your map.⤶
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## Collapsing Prefabs⤶
To collapse a prefab, select it, right click to bring up the context menu `Selected Prefabs` -> `Collapse`.⤶
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When a prefab is collapsed all the objects are left in the world and can be edited on their own as if they were placed individually.⤶
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#Links⤶
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If you want to know about <page>Instances</page>, we have it covered.
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