Condition 'p_tracker_id ==0' it true. returned: __null

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:bust_in_silhouette: Asked By new-gen23

I downloaded the OpenVR demo for Godot and loaded it into the Godot engine. When I run the demo, I can also see it starting my HTV Vive. Steam confirms that the HMD and the controllers are reachable.

However, the Demo always immediately dies with the error:

E 0:00:01:0761 Condition ’ p_tracker_id == 0 ’ is true. returned: __null
servers/arvr_server.cpp:305 @ find_by_type_and_id()

I have no clue there this check is defined. Is this a bug in GODOT or in the ARVR extension?

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:bust_in_silhouette: Reply From: simulated-tea

I came across this error, too.
For me, nothing died though.

However the editor did spam this error message.

I was working with a scene like in the ‘gui_in_3d’ demo:

root
|-- Mesh
|--Viewport
    |-- 2D GUI

where the mesh was using a material, with a viewport texture.

In this situation, the editor gave an error
ViewportTexture: Path to node is invalid.
and then lots of errors, like from the original question.

What helped for me was to switch the order of the nodes:

root
|--Viewport
    |-- 2D GUI
|-- Mesh

and saving, closing and re-open the scene.
(This way the viewport node is present in the tree, once the texture is iniitialized, and no more errors are thrown.