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UAAL (Unity as a library) with Vuforia 8.6.7

February 24, 2020 - 5:22pm #1

On the Vuforia Engine Release Notes page (https://library.vuforia.com/articles/Release_Notes/Vuforia-SDK-Release-Notes.html) in the Vuforia 8.6.10 section "Known Issues / Unity" it says that:

    A black screen is seen when building a Vuforia for Unity as a Library app for iOS with XCode 11. Use Xcode 10.3 instead.

I believe there is a similar issue with version 8.6.7 as well. I created a version of the Unity-as-a-library project with Unity 2019.3.1f1 and Vuforia 8.6.7 following this article - https://library.vuforia.com/content/vuforia-library/en/articles/Solution/using-vuforia-engine-with-unity-as-a-library.html.

This Unity project appears to run correctly when built with Xcode 10.3, but causes an assertion when built with Xcode 11.3. The assertion (which occurs in vuforiaRenderEvent(int)) is:

    validateRenderPassDescriptor:757: failed assertion `Texture at colorAttachment[0] has usage (0x01) which doesn't specify MTLTextureUsageRenderTarget (0x04)'

I also find that this version crashes when Unity is unloaded (using the Unload button that appears in the sample) but this may be because I am not calling UnloadVuforia (Vuforia.VuforiaRuntime.Instance.UnloadVuforia() in C#) from the Swift/Objective-C side.

In my project I do not include any image or object databases or call any Vuforia functions. The scene just consists of a single Directional Light and an AR camera, with the usual Vuforia Behaviour script and the Default Initialization Error script.

I would like some advice about how to proceed. Will Xcode 11.3 be supported for this Unity-as-a-library purpose with the next release of Vuforia?

If it would help I could upload this project for reference.

Thanks

(edit) I've been asked to tag @Cotora, Marius on this post.

UAAL (Unity as a library) with Vuforia 8.6.7

February 26, 2020 - 12:23am #2

Hi,

Bug will be fixed with 9.0, which will be released mid March.

Thank you.

Vuforia Engine Support

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