Can't get it calibrated correctly

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    I have a recently built Sandbox that I can not get calibrated. I’m following the steps in the youtube video The calibration process seems to work fine. I’ve ran through the calibration process more times than I care to count. After I get through the projector calibration the alignment tool follows the red cross hairs really well at all locations and different heights, never being more than 1/16″ off the target. This leads me to believe the calibration process is working and being followed correctly. However, when I start the program, it off by as much as 1.5″. Does anyone have any idea’s ?


    are you starting with -fpv parameter? (I think it stands for “fix perspective view”) Without that the calibration corrections aren’t used. I spent a whole evening recalibrating because I missed that!

    Usage: SARndbox [option 1] ... [option n]
       Prints this help message
    -c <camera index>
       Selects the local Kinect camera of the given index (0: first camera
       on USB bus)
       Default: 0
    -slf <sandbox layout file name>
       Loads the sandbox layout file of the given name
       Default: /home/hello/src/SARndbox-1.5-001/etc/SARndbox-1.5/BoxLayout.txt
    -er <min elevation> <max elevation>
       Sets the range of valid sand surface elevations relative to the
       ground plane in cm
       Default: Range of elevation color map
    -nas <num averaging slots>
       Sets the number of averaging slots in the frame filter; latency is
       <num averaging slots> * 1/30 s
       Default: 30
    -sp <min num samples> <max variance>
       Sets the frame filter parameters minimum number of valid samples
       and maximum sample variance before convergence
       Default: 10 2
    -he <hysteresis envelope>
       Sets the size of the hysteresis envelope used for jitter removal
       Default: 0.1
       Disables elevation color mapping
    -hcm <elevation color map file name>
       Sets the name of the elevation color map
       Default: /home/hello/src/SARndbox-1.5-001/etc/SARndbox-1.5/HeightColorMap.cpt
       Disables topographic contour lines
    -cls <contour line spacing>
       Sets the elevation distance between adjacent topographic contour
       lines in cm
       Default: 0.75
    -wts <water grid width> <water grid height>
       Sets the width and height of the water flow simulation grid
       Default: 640 480
    -ws <water speed> <water max steps>
       Sets the relative speed of the water simulation and the maximum
       number of simulation steps per frame
       Default: 1.0 30
    -wo <water opacity>
       Sets the water depth at which water appears opaque in cm
       Default: 2.0
    -rer <min rain elevation> <max rain elevation>
       Sets the elevation range of the rain cloud level relative to the
       ground plane in cm
       Default: Above range of elevation color map
    -rs <rain strength>
       Sets the strength of global or local rainfall in cm/s
       Default: 0.25
    -evr <evaporation rate>
       Water evaporation rate in cm/s
       Default: 0.0
       Fixes the navigation transformation so that Kinect camera and
       projector are aligned, as defined by the projector calibration file
       Enables hill shading
       Enables shadows
       Enables elevation color mapping
       Renders water surface as geometric surface
    • This reply was modified 5 years, 7 months ago by maphew.
    • This reply was modified 5 years, 7 months ago by maphew.
    • This reply was modified 5 years, 7 months ago by maphew.

    Thanks for the info and the table of switches. I’m going to be looking at this next week and hope to have better news.


    Hi Maphue
    I cannot get any of these command line parameters to run

    ~/src/SARndbox-1.6/bin $ SARndbox -h
    SARndbox: command not found

    I can only think the path is the problem, any thoughts?
    Thanks R


    Please ignore the request above re the command line, got my wires crossed with another problem with the pipe! thanks r


    No problem Ross. I’m sure you figured out that you need the ./ as part of your command. By the way the -fpv switch on the command line fixed my problem 😮


    I have watched the calibration video, but when I run the program, I can not resize the window like is done in the video. When I try and drag the window and resize to the green screen (after putting a white poster board over the sandbox) all I get is the frame tilts. Are there step by step text instructions to augment the video? The video is at:


    Holding down z while dragging allows you to pan and holding down z and click-dragging allows you to zoom.

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