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  • z_*OBSOLETE* Calculate Rigid Body Motion in Matlab

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what you need:

  1. a markercoordinates.csv file 3 columns for each marker (xyz coordinates)
  2. an *xyzpts.csv file from digitized data (may need to be smoothed before calculating rigid body motion)

Note: The number of columns must be a perfect match between the two files.
if you have 10 markers - you must have 30 columns in both files.

what to do:

...

*** OBSOLETE, DO NOT USE ***


CRITICAL UPDATE: Use new XMALab software for marker-based XROMM, including Undistortion, Calibration, Marker Tracking, and Rigid Bodies.
XMALab replaces MATLAB XrayProject. See Bitbucket XMALab wiki for XMALab User Manual (not this wiki). 

Calculate Rigid Body Motion

  1. Type rigidBody into the MATLAB commandline.
  2. Select the .csv file with your calculated CT marker coordinates.
  3. Select your unfiltered (xyzpts.csv) or filtered (xyzptsButter##.csv) data file.
  4. Type the number of bones in the input box.
  5. select Select the markers associated with each bone (omit any markers with all NaNs, i.e. markers that were not digitized).
  6. save Save the file output.

what you get:
A (yourfilename)BoneTforms.csv file with the translations and rotations to drive your bones (in a bizarre, Maya-friendly 16x1 matrix format)

  • To use this file in maya, you will
    • select the bones in the same order used above.
    • type impMatrix at the command prompt
    • select the file saved in step6

...

Other details:
  • rigidBody calls 2 additional scripts: svdrigid and mayaMatrixFormat
  • svdrigid takes marker data for a single bone and outputs rotations and translations
  • mayaMatrixFormat converts the framex3x3 rotation matrices and framex3 translations and converts them to a framex16 rotation matrix in a Maya-friendly format
  • you need a minimum of 3 markers per bone in order for the program to have enough information to calculate the rigid body motion.