Returns the Z component of the given hit test result in 3D space. Hit test results are ordered with the closest first, starting at index 1. This point should only be used for a short time, for example to display a particle effect, as it will drift relative to the real world. If you plan to use this 3D point to position a long lived object in the world then you should create an anchor from this hit test result instead so that it doesn't drift.
float ARGetHitTestZ( index )
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