Moving Object with Raycast can sometimes lose movement

Unity Engine
,
1

I am writing a VR script to move an object when a laser (raycast +linerender) is pointed at the object and the controller trigger is pressed. In general it works fine, except when the laser is close to the edge of the object and the hand controller moves somewhat quickly outside of the object.

Its as if the next FixedUpdate() or Update() does not have the updated moved object coords and the raycast cannot find it.

FWIW I am using XRI with Oculus quest 2, but I think this is a more general VR problem and not specific to implementation.

Here is my script. It is attached to the RH controller.

thanks for looking.

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

public class TestMove : MonoBehaviour
{
    public LineRenderer laserLineRenderer;
    public float laserWidth = 0.1f;
    public float laserMaxLength = 20f;

    private InputDevice _rightHandController;


    private bool _haveLastRaycastHit = false;
    private RaycastHit _lastRaycastHit;
    private bool _lastIsTiggerPressed;


    void Start()
    {
        Vector3[] initLaserPositions = new Vector3[2] { Vector3.zero, Vector3.zero };
        laserLineRenderer.SetPositions(initLaserPositions);

        laserLineRenderer.startWidth = laserWidth;
        laserLineRenderer.endWidth = laserWidth;
        laserLineRenderer.enabled = true;

        var inputDevices = new List<InputDevice>();
        InputDevices.GetDevices(inputDevices);

        foreach (var device in inputDevices)
        {
            if ((device.characteristics & InputDeviceCharacteristics.Right) == InputDeviceCharacteristics.Right &&
                (device.characteristics & InputDeviceCharacteristics.HeldInHand) == InputDeviceCharacteristics.HeldInHand)
            {
                _rightHandController = device;
                break;
            }
        }

        _haveLastRaycastHit = false;
        _lastIsTiggerPressed = false;

    }


    void FixedUpdate()
    {
        RaycastHit raycastHit;
        bool isTriggerPressed;

        // setup ray cast and see if we hit something
        Ray ray = new Ray(transform.position, transform.forward);
        Vector3 endPosition = transform.position + (laserMaxLength * transform.forward);

        var didHitSomething = Physics.Raycast(ray, out raycastHit, laserMaxLength);
        if (didHitSomething)
            endPosition = raycastHit.point;

        // set laser to not go through hit object
        laserLineRenderer.SetPosition(0, transform.position);
        laserLineRenderer.SetPosition(1, endPosition);

        // see if the trigger was pressed
        _rightHandController.TryGetFeatureValue(CommonUsages.triggerButton, out isTriggerPressed);

        if (didHitSomething && isTriggerPressed)
        {
            if (_haveLastRaycastHit)
            {
                // get the delta move from last raycast hit on this content window
                var deltaPosition = (raycastHit.point - _lastRaycastHit.point);
                raycastHit.transform.position += deltaPosition;
            }

            _haveLastRaycastHit = true;
            _lastRaycastHit = raycastHit;
        }
        else
        {
            _haveLastRaycastHit = false;
        }
    }
}
2

I reworked my code. Rather than being raycast hit centric, it is now centric to the triggered was pressed and is pressed during update. Save the game object, and use ray and play to determine new position.