grabbing

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


[RequireComponent(typeof(Rigidbody))]
public class LeftHandScript : MonoBehaviour{

    [SerializeField] OVRInput.Controller Controller = OVRInput.Controller.LTouch;
    [SerializeField] Rigidbody  AttachPoint         = null;
    [SerializeField] Collider   GrabCollider        = null;
    [SerializeField] bool       IgnoreContactPoint  = false;

    Rigidbody   mHeldObject;
    FixedJoint  mTempJoint;
    Vector3     mOldVelocity;
    List<Rigidbody> mGrabCandidates;

    void Start() {
        mGrabCandidates = new List<Rigidbody>();
        if (AttachPoint == null)
            AttachPoint = GetComponent<Rigidbody>();
        if (GrabCollider == null)
            GrabCollider = GetComponent<Collider>();
    }

    void Update() {

        if(mHeldObject==null &&  OVRInput.Get(OVRInput.Axis1D.PrimaryIndexTrigger, Controller) >= 0.5f && mGrabCandidates.Count>0){
            //not holding, trigger down, potential grabbables
            Debug.Log("Grabbing "+mGrabCandidates[0]);
            mHeldObject              = mGrabCandidates[0];
            mHeldObject.velocity     = Vector3.zero;
            mTempJoint               = mHeldObject.gameObject.AddComponent<FixedJoint>();
            mTempJoint.connectedBody = AttachPoint;
            GrabCollider.enabled     = false;
            mGrabCandidates.Clear();

        }else if(mHeldObject!=null){

            if(OVRInput.Get(OVRInput.Axis1D.PrimaryIndexTrigger, Controller) < 0.5f){
                Debug.Log("Dropping "+mHeldObject);
                Object.Destroy(mTempJoint);
                mTempJoint = null;
                throwObject();
                mHeldObject = null;
                GrabCollider.enabled = true;
            }else{
                mOldVelocity = OVRInput.GetLocalControllerAngularVelocity(Controller);
            }
        }
    }

     void OnTriggerEnter(Collider collider){

        GameObject temp = collider.gameObject;
        if (temp != null && temp.layer == LayerMask.NameToLayer("grabbable") && temp.GetComponent<Rigidbody>() != null){
            mGrabCandidates.Add(temp.GetComponent<Rigidbody>());
        }
    }

    void OnTriggerExit(Collider collider){
        Rigidbody rbody = collider.gameObject.GetComponent<Rigidbody>();
        if(rbody!=null)
            mGrabCandidates.Remove(rbody);
    }

     void throwObject(){
        mHeldObject.velocity = OVRInput.GetLocalControllerVelocity(Controller);
        if (mOldVelocity != null)
            mHeldObject.angularVelocity = mOldVelocity;

        mHeldObject.maxAngularVelocity = mHeldObject.angularVelocity.magnitude;
    }



}