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🧪 Practical Task: Prefabs in a Warehouse

Objective

Learn how to create prefabs, apply changes via Overrides, and build nested prefabs.

Context

You are making a warehouse simulator. The warehouse contains shelves, and on them — boxes. Boxes can hold different products, but all boxes share the same base (model, Rigidbody component, BoxSound script).

Task (follow the steps)

🟢 Step 1. Create the base "Box" prefab

  1. Create a Cube in the scene (GameObject → 3D Object → Cube).
  2. Add a Rigidbody component.
  3. Add an Audio Source component (sound when falling).
  4. Attach a BoxSound script (imagine it exists — just add an empty dummy script).
  5. Rename the object to Box_Base.
  6. Drag Box_Base from the Hierarchy into the Project window into a Prefabs folder (create it if needed). It is now a prefab.

🟡 Step 2. Create a nested "Shelf" prefab

  1. Create an empty GameObject → name it Shelf_Base.
  2. Create 3 vertical cubes (shelf legs) and 2 horizontal cubes (shelves) — arrange them neatly.
  3. Now the key part: drag 4 instances of Box_Base from the Project window onto the shelves (inside Shelf_Base as child objects).
  4. Select the parent object Shelf_Base and drag it into the Project window → a Shelf_Base prefab is created, which contains the Box_Base prefab inside. This is a nested prefab.

🔵 Step 3. Modify through an instance (Override)

  1. Drag 3 instances of Shelf_Base from the Project into the Hierarchy (three different shelves in the scene).
  2. On the second shelf, select one of the boxes (the child Box_Base object).
  3. In the Inspector, change its material color to red (or scale it to (1.5, 1.5, 1.5)).
  4. This instance now has an Override (the Overrides button on the parent Shelf_Base becomes active).
  5. Click Overrides → Apply All. What happened to the boxes on the other shelves? (They also became red/large).

🟠 Step 4. Edit the original prefab

  1. Double-click Box_Base in the Project window → Prefab Mode opens.
  2. Increase the box size from (1,1,1) to (1.2, 1.2, 1.2).
  3. Click Save and close Prefab Mode.
  4. Look at all the shelves in the scene. What changed? (All boxes became slightly larger — except those that had their scale overridden? Check!)

🔴 Step 5. Unpack and break the connection

  1. Select the third shelf in the Hierarchy.
  2. Right-click → Prefab → Unpack Prefab (fully detach).
  3. Now delete one box from this shelf. Will boxes on other shelves be deleted? (No, the connection is gone).

❓ Control questions

  • What happens if, after Step 3 (where we applied red color), we change the original Box_Base color to blue?
  • What is the difference between Unpack Prefab and Unpack Prefab Completely?
  • Why are nested prefabs useful in a real project?

🏆 Expected result

You should have a scene with multiple shelves where changing one prefab updates all linked instances, while overrides work locally until applied.

⭐ If this project was useful, put a star on GitHub!