Unity Resource: XYMouseController

Here’s a companion to the XYController example. It demonstrates translating the mouse’s screen coordinates into a point in Unity world space, and using this to position an object. (Translation: it allows a player to move an object around with the mouse.)

It isn’t game-ready, but it’s simple and (hopefully) easy to understand.

Click here to see the code in action.

Here’s the Unity3D project for the above example. And here’s the source code for the XYMouseController script, which is attached to the capsule.

XYMouseController.js

#pragma strict

// FixedUpdate is a built-in unity function that is called every fixed framerate frame.
// According to the docs, FixedUpdate should be used instead of Update when dealing with a
// Rigidbody.
// See http://unity3d.com/support/documentation/ScriptReference/MonoBehaviour.FixedUpdate.html
// for more information.
function FixedUpdate () {
	var mousePos = Input.mousePosition;

	var worldPos = camera.main.ScreenToWorldPoint(
		Vector3(
			mousePos.x,
			mousePos.y,
			Mathf.Abs(transform.position.z - camera.main.transform.position.z)
		)
	);

	var newPos = Vector3(
		worldPos.x,
		worldPos.y,
		transform.position.z
	);

	// Move the object
	rigidbody.MovePosition(newPos);
}

// Require a Rigidbody component to be attached to the same GameObject.
@script RequireComponent(Rigidbody)

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