Re: [w3ctag/design-reviews] WebXR Hit Test Module (#463)

Hit Testing for XR is a very different problem than hit testing for a document. The obvious differences for example is that the XR environment is in 3D where hit tests are fairly known concepts (eg. video games). I don't know what are the concerns with the document hit testing but would they apply to a 3D DOM-less environment? I would be interested to know why you think we can make document hit tests and XR hit tests share the same concepts/models.

XR hit test can also be limited by the underlying platform. For example, with AR hit tests, the underlying ARCore/ARKit frameworks would actually be doing the checks and the UA would only package the response back to the website. Among others, the consequence is that the hit test API in XR has to be asynchronous while a document hit test wouldn't.

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