how to only get the negative or positive part of a GetAxis

Question

I am trying to make a top-down game like Metal Gear Solid 1 and I want my player charter to look at the way he is moving but all the ways I have found online don't work for me so I am trying to make my own here is what I have so far.

  ` moveimput.x = Input.GetAxisRaw("Horizontal");
     moveimput.z = Input.GetAxisRaw("Vertical");

     transform.localEulerAngles = new Vector3(0, 0 * -moveimput.z + moveimput.x * 90, 0);`

I don't know if I am just stupid and the solution is obvious but I need help.

Answer 1

Use Quaternion.LookRotation to generate a Rotation Quaternion you can assign to your transform. You can also use the Vector3.right and .forward constants to build a matching vector a little more conveniently than trying to build a vector from scratch like you did (which can get confusing - you're not stupid :). You tried to do it with Euler Angles, that's a little harder and generally Quaternions are always preferable. With the Eulers, you could use Vector3.SignedAngle(from, to) to get your angle. I advise against it. :)

Recommended way:

 using UnityEngine;
 
 public class SimpleLookRotation : MonoBehaviour
 {
     private void Update()
     {
         // Calculate World-Space Standard Coordinate direction from the input.
         var inputDirection = Input.GetAxis("Vertical") * Vector3.forward + 
                              Input.GetAxis("Horizontal") * Vector3.right;
 
         //If user isn't actively looking with the controller, abort.
         if (inputDirection.magnitude < 0.1f) return;
         
         //Generate rotation and apply it to the transform.
         transform.rotation = Quaternion.LookRotation(inputDirection);
     }
 }

This is the BAD way:

 using UnityEngine;
 
 public class SimpleLookRotation : MonoBehaviour
 {
     private void Update()
     {
         // Calculate World-Space Standard Coordinate direction from the input.
         var inputDirection = Input.GetAxis("Vertical") * Vector3.forward + 
                              Input.GetAxis("Horizontal") * Vector3.right;
 
         //If user isn't actively looking with the controller, abort.
         if (inputDirection.magnitude < 0.1f) return;
 
         //This is not the best way to do it, but to get the angle from a direction, use Vector3.SignedAngle (Mathf.Atan2 is of limited use)
         var eulerAngles = new Vector3(0, Vector3.SignedAngle(Vector3.forward, inputDirection, Vector3.up), 0);
         
         //Generate rotation and apply it to the transform.
         transform.eulerAngles = eulerAngles;
     }
 }

Protip: You probably want to smooth out your rotation a little, for a start you can use this (use a number > 0 and <= 1 to smooth it, higher numbers turn faster):

 //Generate rotation, smooth it from the previous, and apply it to the transform.
 var softRotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(inputDirection), 0.2f);
 transform.rotation = softRotation;

how to only get the negative or positive part of a GetAxis

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