XR Ray Interactor

[j7j7]

When using the standard XR Ray interactor - the Nova UIBlock is not recognised by the line renderer for culling.

The button does work, and is selectable via the controller button, using the example Nova Input Manager XR script
(Although I will need to make it work via the Trigger - but that's another thing).

Line render culling via the Unity Canvase

Line render passing through the Nova UIBlock2D

[dkonik]

I will tag this as Under Consideration to add proper support. However, adding the following script to your scene may unblock you for the time being. I want to emphasize that this sample NovaRaycaster may not be a complete solution. While it seemed to work in a simple test scene I had setup using the UI Controls included with Nova, without diving deeper into the details of the raycaster system and the XR Ray Interactor I can't guarantee it will handle all scenarios.

using Nova;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.XR.Interaction.Toolkit.UI;

public class NovaRaycaster : BaseRaycaster
{
    public Camera Cam = null;

    public override Camera eventCamera => Cam;

    public override void Raycast(PointerEventData eventData, List<RaycastResult> resultAppendList)
    {
        if (!(eventData is TrackedDeviceEventData trackedEventData))
        {
            return;
        }

        List<Vector3> rayPoints = trackedEventData.rayPoints;

        for (var i = 1; i < rayPoints.Count; i++)
        {
            Vector3 from = rayPoints[i - 1];
            Vector3 to = rayPoints[i];

            float rayDistance = Vector3.Distance(to, from);
            Ray ray = new Ray(from, (to - from).normalized * rayDistance);

            // Raycast against Nova content
            if (!Interaction.Raycast(ray, out UIBlockHit hit, rayDistance))
            {
                continue;
            }

            RaycastResult castResult = new RaycastResult
            {
                gameObject = hit.UIBlock.gameObject,
                module = this,
                distance = (hit.Position - from).magnitude,
                index = resultAppendList.Count,
                depth = 0,
                worldPosition = hit.Position,
                worldNormal = -hit.Normal,
            };

            resultAppendList.Add(castResult);
            trackedEventData.rayHitIndex = i;
            break;
        }
    }
}

[j7j7]

Thank you -
Although I couldn't get the script to work this is the error message when trying to use it.

Assets\Nova\Scripts\Personal\NovaRaycaster.cs(6,22): error CS0234: The type or namespace name 'Interaction' does not exist in the namespace 'UnityEngine.XR' (are you missing an assembly reference?)

If I changed the include to be just UnityEngine.XR
then TrackedDeviceEventData field is not available:

    if (!(eventData is TrackedDeviceEventData trackedEventData))

I have the XR toolkit and XR interaction framework installed - this is just a blank project with Nova.

The ray line is as below:

What I may do as a temp workaround is have the native blank Unity canvas overlayed in front of the Nova UI block, so that at least the ray line is truncated until I can figure it out correctly.

[dkonik]

Sounds like the canvas workaround may be a good workaround for now. That being said, I think if you moved the NovaRaycaster script I provided outside of the Nova/Scripts folder, it may resolve the issue you are seeing (for example, if you put it in Assets/Scripts/CustomNovaScripts or something along those lines).

[marc-antoine-girard]

@dkonik I tried the code you provided and while it works when the UI isn't moving, if the UI moves or is child of an object that moves in FixedUpdate, the reticle keeps jumping around. I have a Unity canvas next to it, and when I hover on it, the laser/reticle behaves correctly. I'm guessing it's something about when Nova updates and Interaction.Raycast works. Do you have any idea on how to make it work?