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Fixed in 2018.2.X

Votes

3

Found in

2017.1.0f3

Issue ID

940733

Regression

No

ScreenPointToRay has a huge offset when using VR headset

XR SDK

-

Steps to reproduce:
1. Open attached project "940733.zip"
2. Open "Sample" scene
3. Select 'Main Camera' in the Hierarchy
4. Under 'TestRaycast' script component set 'TestMode' to ScreenCenter
*this will cast a ray to the center of the screen and place the 'sphere cursor' there*
5. Connect VR device and enable VR Support
6. Enter Play mode

Result: ScreenPointToRay(center of the screen) returns a direction with a huge offset

Alternatively:
1. Under 'TestRaycast' script component set 'TestMode' to MouseInput
2. Enter Play mode
3. Hold mouse button 0 and move the cursor around the screen

Result: ScreenPointToRay(mouse position) returns a direction with an offset depending on the mouse position (video attached)

Reproducible with: 5.6.3f1, 2017.1.0p3, 2017.2.0b6, 2017.3.0a3

Devices used:
HoloLens - only reproducible with Holographic Emulation in Editor, but not in builds
Oculus Rift DK2 - reproducible in builds as well as in Editor

Note: ScreenPointToRay works just fine without VR support
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Comments (3)

  1. Max_Aigner

    Apr 19, 2022 14:42

    sorry for pushing this super old topic. Anyway for someone having stumbling above this post now, the solution was fairly simple:

    Just change the "Target Eye" for your "Camera" to "None (Main Display)" and everything will work again.
    Also the UI.

  2. Max_Aigner

    Apr 19, 2022 13:50

    Well I do have the same issues here in Unity 2020.3.23f1
    If I disable the VR Support, the ScreenpointToRay command workes like a charm. But as soon as I turn on Oculus Quest 2, the Origin of the ray is off. The direction however works fine. (Oculus Quest 2 connected to the Computer via the Oculus cable)

  3. vbs

    Dec 06, 2017 02:51

    I have tried both

    Ray ray = cam.ViewportPointToRay(new Vector3(0.5F, 0.5F, 0));

    and

    Ray ray = new Ray(m_Camera.position, m_Camera.forward);

    as well as visualizing the rays with

    Debug.DrawRay(ray.origin, ray.direction * m_DebugRayLength, Color.green, m_DebugRayDuration);

    and

    Debug.DrawRay(m_Camera.position, m_Camera.forward * m_DebugRayLength, Color.yellow, m_DebugRayDuration);

    and for me the direction of the ray is good, but the origin is never the center of the camera / viewport on the Y axis. the Y axis seems to be 0, even though my camera is clearly not at 0 on the y axis. (rays shoot from the feet of my character in VR, using Oculus Rift. Unity 2017.3.f10

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