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I’ll try breaking my reply into smaller bits to see which parts are rejected. If you need help getting any of these to work, please don’t hesitate to ask.
Let’s begin…
There are two (and a half) official interfaces for removing rainwater: the -evr command line argument and configuring a Vrui tool to “Manage Water”.
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Quoting from the help output: “-evr <evaporation rate> Water evaporation rate in cm/s”. This can set a constant evaporation rate to remove water over time, but is fixed during the run of SARndbox.
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The “Manage Water” tool can be bound to keyboard keys (or USB buttons) to globally add and remove water. Step 15 has an example of binding this tool.
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The “and a half” method is that water flows out of the sandbox at its edges. Shaping the sand so that the box edges are low points in the topography will let the water escape the sandbox.
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I also have an unofficial method using the SARndbox control pipe. My own method is to make the “-evr” function available via the control pipe. With this patch, the evaporation rate can be changed from an external program.
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