change character movement axis in respect to camera orientation?

Question

Hi all, so a few days ago i did the basic "Unity roll-a-ball" tutorial and spent some time afterwards playing around with the character controller. so far, i have an empty player object 'player' that has a few children; 'Ball' object with a rigidbody and a PlayerController script to move it around that looks like this:

 using UnityEngine;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour {
 
     public float speed;
 
     private Rigidbody rb;
 
     void Start () {
         rb = GetComponent<Rigidbody> ();
     }
 
     void FixedUpdate () {
         float moveHorizontal = Input.GetAxis ("Horizontal");
         float moveVertical = Input.GetAxis ("Vertical");
 
         Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
 
         rb.AddForce (movement * speed);
     }
 }

and 'Gyro' empty object with the main camera attached. the 'gyro' has a script that originally only kept the gyro object offset from the rotation of the Ball so that i could just attach the camera to it. i extended on its abilities a bit by adding in a chunk of code to allow the user to orbit the ball based on moving the mouse. the gyroScript looks like this:

 using UnityEngine;
 using System.Collections;
 
 public class gyroScript : MonoBehaviour {
 
     public GameObject target;
     // the target in this case is the ball object
     public float speed = 10f;
     public float rotationSpeed = 100.0f;
     private Vector3 offset;
 
     void Start () {
         offset = transform.position - target.transform.position;
     }
 
     void Update()
     {
         mouseOrbit();
     }
 
     void LateUpdate () {
         transform.position = target.transform.position + offset;
             // this keeps the gyro object stable in comparison to the ball object
     }
 
     void mouseOrbit()
     {
         float translation = Input.GetAxis("Mouse Y") * speed;
         float rotation = Input.GetAxis("Mouse X") * rotationSpeed;
         translation *= Time.deltaTime;
         rotation *= Time.deltaTime;
         transform.Translate(0, 0, translation);
         transform.Rotate(0, rotation, 0);
             // this rotates the gyro object about the Y axis by means of mouse movement
             // because the camera is a child of this it rotates about with it
     }
 }

the code here does not rotate the camera but the gyro object which results in the camera being rotated about the object because it is parented.

My Question:

when i orbit the gyro, the player controller script does not adjust (e.i. to set the W key as the 'forward', D to right, ect...) based on the orientation of the gyro object because it is basing what is forward on the global horizontal and vertical as defined in the Player Controller Script.

how would i go about linking the two together so when i turn the gyro object and press to go 'forward', i go forward based on the direction the gyro object is facing rather than the global horizontal and vertical axis?

Answer 1

Best Answer

Answer by andycodes · Feb 10, 2016 at 11:10 PM

I discovered the solution!

It is required to set a target to the gyro object and delete the old vector3 and modify the add force attributes as such:

 using UnityEngine;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour {
 
     public float speed;
 
     private Rigidbody rb;
 
     public GameObject target; //new code
     // target is the object you will take the rotations from
 
 
     void Start () {
         rb = GetComponent<Rigidbody> ();
     }
 
     void FixedUpdate () {
         float moveHorizontal = Input.GetAxis ("Horizontal");
         float moveVertical = Input.GetAxis ("Vertical");
 
 
         //Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical); (old code)


         rb.AddForce(moveVertical * target.transform.forward * speed); //new code
         rb.AddForce(moveHorizontal * target.transform.right * speed); //new code


         //rb.AddForce (movement * speed); (old code)
 
     }
 }

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Gemesil · Jul 16, 2020 at 01:45 PM 0

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This works but only partly, the camera seems to teleport around every few seconds or so and if you hold both keys from a different axis like W and D or A and S it glitches out.

change character movement axis in respect to camera orientation?

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