Using mesh bounds for moveable area

Unity Engine
1

I am trying to restrict the movement of my object by only running my movement code if the object is within the bounds of a cube. This works fine for stopping my object at the bounds of the cube, but I can’t figure out how to all movement, just not beyond the bounds.

I tried to just offset my object when it reached the bounds but that doesn’t seem to move my object at all, I may be approaching it wrong.

Here is my script, it’s a bit simple and probably not very efficent, I’m still learning.

Thanks for any help.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ShipMovement : MonoBehaviour
{

    public float moveSpeed = 10f;
    public float turnSpeed = 10f;

    Transform myT;
    private float myTx;
    private float myTy;
    private float myTz;

    public Collider flyZone;
    private Vector3 minFly;
    private Vector3 maxFly;

    private bool hasFlyZone = false;

    private bool inFlyZone = false;


    private void Awake()
    {
        myT = transform;

        if (flyZone != null)
        {
            hasFlyZone = true;
            minFly = flyZone.bounds.min;
            maxFly = flyZone.bounds.max;
        }
    }

    void Update()
    {
        Thrust();
        Turn();
    }

    void Turn()
    {
        float pitch = turnSpeed * Time.deltaTime * Input.GetAxis("Pitch");
        float yaw = turnSpeed * Time.deltaTime * Input.GetAxis("Horizontal");
        float roll = turnSpeed * Time.deltaTime * Input.GetAxis("Roll");
        myT.Rotate(pitch, yaw, roll);
    }

    void Thrust()
    {
        if (Input.GetAxis("Vertical") > 0)
        {
            {
                myTx = myT.position.x;
                myTy = myT.position.y;
                myTz = myT.position.z;



                if (hasFlyZone && myTy > minFly.y && myTy < maxFly.y && myTx > minFly.x && myTx < maxFly.x && myTz > minFly.z && myTz < maxFly.z)
                {
                    inFlyZone = true;                   
                }
                else inFlyZone = false;

                if (inFlyZone)
                {
                    Debug.Log("Inside FlyZone!");
                    myT.position += myT.forward * moveSpeed * Time.deltaTime * Input.GetAxis("Vertical");
                }

                if (myTx < minFly.x)
                {
                    myTx = minFly.x +5;
                    Debug.Log("Moved in");
                }
                if (myTx > maxFly.x)
                {
                    myTx = maxFly.x -5;
                    Debug.Log("Moved in");
                }

                if (myTy < minFly.y)
                {
                    myTy = minFly.y +5;
                    Debug.Log("Moved in");
                }
                if (myTy > maxFly.y)
                {
                    myTy = maxFly.y -5;
                    Debug.Log("Moved in");
                }

                if (myTz < minFly.z)
                {
                    myTz = minFly.z +5;
                    Debug.Log("Moved in");
                }
                if (myTz > maxFly.z)
                {
                    myTz = maxFly.z -5;
                    Debug.Log("Moved in");
                }

            }
        }
    }

}
2

You are changing your myTx,y,z values but you are not applying them to your transform. So you are changing some values and then do nothing with those changes.

3

Thanks for your reply. I have tried to add the following:

   if (myTx < minFly.x)
                {
                    myTx = minFly.x +5;
                    myT.position.x = myTx;
                    Debug.Log("Moved in");
                }

But I get an error, “cannot modify the return value of transform.position” because it is not a variable.

Thanks for your help.

4

To be able to edit the position you will need to save it to a variable, modify it and apply it to the transform or do it with:

myT.position = new Vector3(x, y, x);
5

Understood! Thanks for your help!