[ARF 2.1.0] ARRaycastManager doesn't find planes within infinity

[nilsk123]

Hi,

We just migrated to these packages:

AR Foundation 2.1.0 preview 2
ARCore XR 2.1.0 preview 4
ARKit XR 2.1.0 preview 3

Unity 2019.1.3F1

Thank you for your continued efforts and support developing ARFoundation, it truely makes ar development much easier and more maintainable.

We use the ray version of the arsession/arraycastmanager to find infinite planes using the following code

Ray r = new Ray(transform.position, transform.TransformDirection(Vector3.down)); if (m_RaycastManager.Raycast(r, s_Hits, TrackableType.PlaneWithinInfinity)) { if(s_Hits.Count > 0) { hitPose = s_Hits.Last().pose; infiniteAnchor = m_ReferencePointManager.AddReferencePoint(hitPose); } }

This never returns a hit in the new arfoundation versions, eventhough arplanemanager indicates one or more planes have been found. This exact code works just fine when trying to find PlaneWithinPolygon, and has always worked fine for infinity too in previous versions.

[tdmowrer]

This behavior did change in 2.1, and it's pretty subtle.

ARCore doesn't really support a PlaneWithinInfinity type of query. In ARFoundation 1.0, we incorrectly assigned any hit with a plane a PlaneWithinInfinity trackable type. ARCore's hit test support is closer to ARFoundation's PlaneEstimated. So it's not really raycasting against the infinite plane, but it will still be pretty generous. If you change your raycast query to include PlaneEstimated, you should get the same behavior that you had in 1.0.

You can also query for which types of TrackableTypes are supported with ARRaycastManager.descriptor.supportedTrackableTypes.

[nilsk123]

This behavior did change in 2.1, and it's pretty subtle.

ARCore doesn't really support a PlaneWithinInfinity type of query. In ARFoundation 1.0, we incorrectly assigned any hit with a plane a PlaneWithinInfinity trackable type. ARCore's hit test support is closer to ARFoundation's PlaneEstimated. So it's not really raycasting against the infinite plane, but it will still be pretty generous. If you change your raycast query to include PlaneEstimated, you should get the same behavior that you had in 1.0.

You can also query for which types of TrackableTypes are supported with ARRaycastManager.descriptor.supportedTrackableTypes.

Hi, thanks for the explanation as always. I have been experimenting with the different trackable types, but none are anywhere near as forgiving as the infinite behaviour in 1.0. Is there any way to get that exact behaviour? In 1.0, when querying the plane within infinity, it would literaly alway find a plane.

[oktomus]

Hi, I'm trying to achieve the same behavior as @nilsk123.

In 1.0, when querying the plane within infinity, it would literaly alway find a plane.

There isn't any way to do this ? Even with a custom Plane and a custom Raycast from the camera ?

[Dryra]

Hi, I'm trying to achieve the same behavior as @nilsk123.

In 1.0, when querying the plane within infinity, it would literaly alway find a plane.

There isn't any way to do this ? Even with a custom Plane and a custom Raycast from the camera ?

Yes there is, on iOS, you would only have to check againt the raycasts from the Trackable type TrackableType.PlaneWithinInfinity, as it works as expected.

For Android, what you can do is, first check for either a camera raycast or Raycast Manager raycast:

if (m_RaycastManager.Raycast(ray, s_Hits, TrackableType.PlaneWithinPolygon) || m_RaycastManager.Raycast(ray, s_Hits, TrackableType.PlaneEstimated) || Physics.Raycast(ray, out hit, Mathf.Infinity, LayerMask.GetMask("PlaneHelper")))

and inside that condition get the first pose position from the ARplane that you get and spawn a 50 meter plane and then check the raycast to that plane and the ARplane at the same time.

if (!planePlaced)
                    {
                        var hitPose = s_Hits[0].pose;
                        planeObject.transform.position = new Vector3(hitPose.position.x, hitPose.position.y - 0.10f, hitPose.position.z);
                        planeObject.SetActive(true);
                        planePlaced = true;
                    }
                    if (Physics.Raycast(ray, out hit, Mathf.Infinity, LayerMask.GetMask("PlaneHelper")))
                    {
                        poseToHit = hit.point;
                    }

                    if (m_RaycastManager.Raycast(ray, s_Hits, TrackableType.PlaneEstimated) || m_RaycastManager.Raycast(ray, s_Hits, TrackableType.PlaneWithinPolygon))
                    {
                        if (s_Hits[0] != null)
                        {
                            poseToHit = s_Hits[0].pose.position;
                        }
                    }

this is just a general idea on how you can achieve this, it is possible.

[KyryloKuzyk]

Please see this response:
#893 (comment)