RTS-Style Drag Select, Click to Select/Deselect, and Movement | AI Series Part 26

Learn how to implement RTS-style drag selection, point and click selection, shift+click to select and deselect new units, and issue movement commands! This is sometimes also called "box selection".

You'll also learn how to configure a SelectionManager singleton class that controls which units are currently selected, as well as automatically self-registering SelectableUnits.

In AI Series Part 26 we'll be covering how to do all of the above RTS-style features and discussing the "gotchas" that are easy to run into when implementing the drag selection.

We'll be using 2 key functionalities of the Camera class to achieve this:

⚫ Camera.ScreenPointToRay to do Raycasts from the Camera.

⚫ Camera.WorldToScreenPoint to determine which SelectableUnits are within our selection box.

As usual with the AI Series, we're using the NavMesh Components: https://docs.unity3d.com/Manual/NavMesh-BuildingComponents.html not the built-in navigation system.

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