Upgrades to Vrui-4.2-xxx, Kinect-3.2, SARndbox-2.2

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    Oliver Kreylos
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    We’ve been having a bit of a rough upgrade due to a lot of piled-up changes from the previous versions of these three software packages to the current ones.

    If you run into issues, please check the “Complete Installation Instructions” thread carefully, as there are a few subtle changes. The updated instructions should get the AR Sandbox up and running again.

    That said, there are also a few, and some unintentional, changes in running the AR Sandbox.

    Most importantly, you need to add -uhm (“use height map”) to the command line to apply a topographic color map, and you need to add -rer 20 100 (“rain elevation range”) to the command line to have rain clouds working. The two values after -rer are the minimum and maximum rain cloud elevation; you can adjust those to taste.

    Rain cloud detection has changed on the whole. In pre-2.0 versions of SARndbox, the software looked for any non-moving object in the defined rain elevation range. This caused lots of issues with arms or heads causing unintentional rain, and hands often not causing rain due to small movements.

    Post-2.0 versions of SARndbox specifically look for an open-hand rain gesture: hand flat above the sand surface, ideally palm down, and all five fingers spread out. Based on our testing, this new method works more reliably than the old one, and does not induce a one-second delay before applying rain. If you make the gesture, it starts raining immediately (i.e., within 1/30s).

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