Can't get it calibrated correctly

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This topic contains 7 replies, has 5 voices, and was last updated by  mhorton92586 2 years, 11 months ago.

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  • #101753

    mmcclain
    Participant

    I have a recently built Sandbox that I can not get calibrated. I’m following the steps in the youtube video https://www.youtube.com/watch?v=EW2PtRsQQr0. 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 ?

    #101754

    maphew
    Participant

    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]
    Options:
    -h
       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
    -nhm
       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
    -ncl
       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
    -fpv
       Fixes the navigation transformation so that Kinect camera and
       projector are aligned, as defined by the projector calibration file
    -hs
       Enables hill shading
    -us
       Enables shadows
    -uhm
       Enables elevation color mapping
    -rws
       Renders water surface as geometric surface
    
    • This reply was modified 3 years, 2 months ago by  maphew.
    • This reply was modified 3 years, 2 months ago by  maphew.
    • This reply was modified 3 years, 2 months ago by  maphew.
    #101767

    mmcclain
    Participant

    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.

    #101822

    Ross
    Participant

    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

    #101830

    Ross
    Participant

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

    #101835

    mmcclain
    Participant

    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 😮

    #101858

    efpatterson
    Participant

    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: https://www.youtube.com/watch?v=EW2PtRsQQr0

    #101971

    mhorton92586
    Participant

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

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