Hello everyone !

Today, I created my first VR application for Oculus Quest. I modified my Roll a Ball game to work in VR.

First, I downloaded the VRTK project from VRTK4’s Github, in order to use some of its packages. I changed the project settings as followed :

Then, still in the VRTK project, I imported the Oculus Integration package.

I exported my Roll a ball project assets, and imported it in my VRTK project :

Since we do not use UnityEngine.InputSystem in the VRTK project, I had to comment every part of my scripts that used it. When the errors vanished, I set up the environment.

I deleted the camera, created a floor, a table, and the Empty GameObject for the non-interactable objects. I added a box collider to my Roll a Ball object, and created two new layers for this object and its children.

Unfortunately, my project was to heavy for my computer and made it very slow.

So, I tried to follow another guide from the VRTK website, describing the essential packages to import. However, it did not work because the guide used a 2018 package that was missing a lot of components regarding the OVR Camera.

Finally, I tried to optimize my project by only keeping the needed elements from the VRTK initial package, for example, I deleted the sample scene, and the 2D sprite package. Also, I only downloaded the necessary components from the Oculus Integration package, I left out the example scene, the avatar models, the shared assets and the Spatializer scenes. It worked, I could continue to build game with a functional computer !

I added the OVRCameraRig to the scene and set its origin to the ground.

I added the component Linked Alias Association Collection (which was missing in the 2018 VRTK packages) to the OVRCameraRig.

The Left Hand and Right Hand Anchors got the OVRControllerPrefab, with the right parameters : L and R touch controller.

I added TrackedAlias to the scene, put its size to 1 and dragged the OVRCameraRig to the slot.

TrackedAlias got an Interactor, as a child of the Left and the Right Controller Aliases.

I created an empty GameObject : LeftTriggerAxis, with the component Unity Axis 1D Action, and the Axis Name VRTK_Axis9_LeftTrigger (found on the InputManager of the Project Settings).

I created another GameObject : LeftTriggerPressed, and added to it the Float to Boolean and Boolean Action components.

I did the same for the right.

Then, in Interactor I completed the slots with the LeftTriggerPressed and the LeftControllerAlias; and repeated it for the right.

To be able to interact with my Roll a Ball as a virtual object, I added the Interactable.Primary_Grab to the scene, and placed the Roll a Ball in its Meshes.

In order to add physics to this virtual object, I set up the Velocity Tracker in the OVRCameraRig. I copied the OVRAnchorVelocityEstimator from the VRTK Github, and added it to the Linked Alias Association Collection. I added as its components the CenterEye, the LeftHand and the RightHand Anchores, and set their references :

I added UI :

Finally, I build and run my project on an Oculus Quest using Oculus link :

It did not work, my scene stayed black in Virtual Reality, I could only see the limits of my guardian :

I tried to follow again every step of the guide to see if I missed something, but I did not.

Since the Oculus Application alerted me that my graphic card was not powerful enough for a VR game, I tried to run the application on another computer, but it still did not worked.

The problem could also come for the fact that I did not download all the components of the VRTK project and the Oculus Integration project. So, I downloaded all of them in the powerful computer, and run my project. Anything changed.

I tried to move the groud and my Roll a Ball object to see if the player was in the ground, but still I saw nothing.

I also tried to see if I had the same problem with an example scene, and it was the same : my screen stayed black.

Therefore, the issue must come from one of the package’s component I used, that must be obsolete. However, I was not able to find it.