UDT ImageTargetBuilder.FrameQuality FAIL
This article goes through details about what makes a good image target and how to optimize the experience https://library.vuforia.com/articles/Solution/Optimizing-Target-Detection-and-Tracking-Stability.html
Since UDTs are still image targets, this article should help you get a sense of what are good UDTs to encourage your users to use. If you are uncertain if an image would make a good UDT, you could try uploading it to a target database and see how it is rated.
Hope this helps!
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