Bonus round: I think I read something about changing the drain/evaporation rate somewhere on the forum, but can’t find it now. Is there a setting for this, or would it require another script addition? The installation is primarily for school-age children, so a faster or even instant drain rate would help with keeping their attention.

Below is the code in the shell script in the desktop icon (i.e. what you get when you right-click the icon and open with text editor). Could someone explain what the syntax is telling the computer to do here, and what I need to add to make it reference SARndbox.cfg?

#!/usr/bin/env bash

if [[ $1 -ne 0 ]]; then
    sleep $1
fi

~/src/SARndbox-2.3/bin/SARndbox -mergeConfig ~/src/Vrui.cfg -uhm -fpv

I did a file search on our system and SARndbox.cfg exists and contains the following:

# Configuration file for SARndbox application
# Copyright (c) 2016 Oliver Kreylos

section SARndbox
    section Camera
        # Configuration parameters for Kinect v1
        compressDepthFrames true
        smoothDepthFrames false
    endsection
endsection

Do you plan to use the sandbox computer for anything other than the sandbox? If not, does it matter that there will not be OS updates? Unless and until there is a new sandbox release, LM 19 will continue to work.

No, this computer is only for the sandbox. It probably doesn’t matter, but better to ask than assume when I don’t have the experience myself.

I’ve hit a snag updating the BIOS and will probably move on to installing Mint 19. With the problems I’ve been having I don’t want to introduce complexity by needing to modify Mint 21.

Thank you.

Awesome, thank you!

I am having problems getting posts and comments to go through. I will keep trying to get my actual question posted in a comment here.

Thank you for the tip, the old forum was very useful, although it looks like not all of it wound up archived. I had been taking each set of tie points at the same height. I will try varying within the set and hopefully that plus having our sand will do it.

(This OP went into mod queue because of the links. Anti-spam measure, I guess.)

Hello!

This was the problem. I replaced the pipe strapping with a thin allthread rod and was able to get a green target. I took tie points at four height levels and two base plane levels (two heights for each) and got what seems like good calibration according to the red crosshairs following and lining up with the target throughout the sandbox. When running the sandbox program contour lines matched up with the objects I placed in the box.

However, when I exited the calibration, the command window had the message:

“Calibration error: Some tie points have negative projection weights. Please start from scratch”

This message was also on all previous calibration attempts, but I had hoped fixing the target problems would resolve it. What does negative projection weights mean and how do I fix it?

That makes sense now. In a way this is easier b/c the previous installation was working at the time they mothballed it, which means I’m just following steps. On the other hand, I’d be getting a better understanding doing it from scratch.