Menu item to create 100 randomly positioned prefab clones

Sometimes we want to create lots of pickups, randomly in our scene. Rather than doing this by hand, it is possible to add a custom menu and item to the Unity editor, which, when selected, will execute a script. In this recipe, we create a menu item that calls a script to create 100 randomly positioned star pickup prefabs in the Scene:

Getting ready

This recipe assumes you are starting with the project Simple2Dgame_SpaceGirl setup from the first recipe in Chapter 3, Inventory UI.

How to do it...

To create an editor extension to add 100 randomly located copies of a prefab with one menu click, follow these steps:

1. Start with a new copy of mini-game Simple2Dgame_SpaceGirl.
2. In the Project panel, create a new folder named Prefabs. Inside this new folder, create a new empty prefab named prefab_star. Populate this prefab by dragging GameObject star from the Hierarchy panel over prefab_star in the Project panel. The prefab should now turn blue and...