Embedded Files
A couple important notes:
A couple important notes:
- Unity rotations are stored as "Quaternions". These are four complex numbers. Never manually change a rotation such as "transform.rotation.x". Instead use the built in Unity methods from the Quaternion class, such as "Quaternion.Euler()" to set the euler angles (the x-, y-, z- rotation values you see in the Unity Editor).
- In 2D, we use the right direction as the default "forward". We can move in this direction easily, or point this in any direction easily by using our GameObject's current forward direction: "transform.right"
- In 3D, and in Unity as a whole, "forward" means along the positive Z-axis ... or in other words straight into the screen in a 2D world. This means that a lot of the method that seem so tempting such as "Quaternion.LookRotation()" will not work for us without some serious tweaking. Instead, we often use trigonometry to find angles we need.
Examples of Commonly Used Code
Examples of Commonly Used Code
Current Mouse Position in Your Game
Point the Sprites right direction at the Mouse
Rotate at a Constant Speed
Rotate Using the Left and Right Arrow Keys
Orbit Around a Point
Some Great Resources:
Some Great Resources:
"How to Make a Homing Missile" (9min, Oct 2017) by Brackeys.
"How to Make a 2D Ranged Combat System" (11min, Aug 2018) by BlackThornProd. A video of how to rotate a 2D gun to face in the direction of the mouse cursor, so it can shoot in that direction.
"Rig and Animate 2D Characters in Unity 2018" (23min, Oct 2018) by Sykoo. A video on how to rig up a skeleton 2D character made of many sprites, then animate how they move together.
"Intro to Quaternion Rotations" (33min, Sep 2017) by Hardly Difficult. A very detailed look at the basics of 3D rotations and Quaternions.
"Quaternions - Unity Official Tutorials" (6min, Sep 2013). A really brief overview of Quaternions and rotations.
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