In VR development ,how can I make a handle shotting?

Question

I want to make an example of shot, then I wrote this in the handle button event，

using UnityEngine;
using System.Collections;

public class fire : MonoBehaviour {
public GameObject bullet;

SteamVR_TrackedObject trackedObj;
void start() {
    trackedObj = GetComponent<SteamVR_TrakedObject>();
}
void Update() {
    var device = SteamVR_Controller.Input((int)trackedObj.index);
    if (device.GetTouchDown(SteamVR_Controller.ButtonMask.Trigger)) {
        GameObejct obj = Instantiate(bullet,transform.position);
        Vector3d fwd = transform.TransformDirection(Vector3.forward);
        obj.GetComponent.<Rigidbody>().AddForce(fwd*2800);
    }
}
}

but when debugging and I press handle button ,it didn't produce a bullet,and had erred at the line
var device = SteamVR_Controller.Input((int)trackedObj.index);, the error is:

Object reference not set to an instance of an object.

trackedObj is null. Try using a capital S in your Start method. Not sure if they're case sensitive, but it seems like it. — Fredrik Schön, Feb 25 '17 at 07:49
And if that didnt work, make sure the object this script is attached to actually have the SteamVR_TrackedObject in it — Fredrik Schön, Feb 25 '17 at 07:58
ok,I use a capital S in my Strat mehod,it can work,thank you! — project_01, Feb 26 '17 at 07:31

score 0 · Answer 1 · answered Mar 04 '17 at 07:43

First You should need to confirm that your fire script is attached to your controller object and your controller object also attached SteamVR_TrackedObject script (which provide by steam plugin). Then, lastly ensure this line is executing

void start() {
    trackedObj = GetComponent<SteamVR_TrakedObject>();
}

In VR development ,how can I make a handle shotting?

1 Answers1