vr-space-station/Assets/Scripts/VR/BowGrab.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using VRTK;
using VRTK.SecondaryControllerGrabActions;

public class BowGrab : VRTK_ControlDirectionGrabAction
{

    [SerializeField]
    private Vector3 m_angleOffset;

    [SerializeField]
    private Transform m_notchPoint;

    [Header("Pull settings")]
    [SerializeField]
    private float m_maxPullDistance = 0.5f;

    [SerializeField]
    private string m_animationParam = "bowPull";

    [Header("Arrow Settings")]
    [SerializeField]
    private GameObject m_arrowPrefab;
    [SerializeField]
    private Transform m_arrowSpawn;

    [SerializeField]
    private float m_maxForce = 10f;


    private Animator m_animator;
    private Vector3 m_lastForward;
    private float m_lastForce;

    private void Start()
    {
        m_animator = GetComponent<Animator>();
    }

    public override void ProcessFixedUpdate()
    {
        if (initialised)
        {
            AimObject();
            PullBow();
        }
    }


    protected override void AimObject()
    {
        Vector3 direction = Vector3.Slerp((primaryGrabbingObject.transform.position - secondaryGrabbingObject.transform.position).normalized, primaryGrabbingObject.transform.forward, 0.5f);
        transform.rotation = Quaternion.LookRotation(direction, primaryGrabbingObject.transform.up) * Quaternion.Euler(m_angleOffset);

        m_lastForward = direction;
    }

    protected virtual void PullBow()
    {

        float animationValue = getBowForce();

        m_animator.SetFloat(m_animationParam, animationValue);
        m_lastForce = animationValue;

    }


    public override void ResetAction()
    {
        base.ResetAction();
        m_animator.SetFloat(m_animationParam, 0);

        if (m_lastForce > 0.1f)
        {

            GameObject arrow = Instantiate(m_arrowPrefab);
            arrow.transform.position = m_arrowSpawn.transform.position;
            arrow.transform.forward = m_lastForward;

            Rigidbody rb = arrow.GetComponent<Rigidbody>();
            rb.velocity = arrow.transform.forward * m_lastForce * m_maxForce;
        }

        m_lastForce = 0;
        m_lastForward = Vector3.zero;
    }


    private float getBowForce()
    {
        Vector3 directionSecondHand = secondaryGrabbingObject.transform.position - m_notchPoint.transform.position;
        Vector3 directionPrimaryHand = primaryGrabbingObject.transform.position - m_notchPoint.transform.position;

        float force = 0;
        if (Vector3.Dot(directionSecondHand, directionPrimaryHand) > 0)
            force = 0;
        else
        {
            force = directionSecondHand.magnitude / m_maxPullDistance;
            if (force > 1)
                force = 1;
        }


        return force;
    }

}