Measure CT Marker Coordinates in Maya

What you need:
Mesh models of your radio-opaque markers in .obj format
Mesh models of your bones in .obj format

What you get:
A .csv file containing the xyz coordinates of your markers in CT space

In this step, 3D models of the bones and their markers will be imported into Maya. Then the XYZ coordinates of the markers, relative to the polygonal models of the bones, will be measured and saved as CTmarkerCoordinates. This step is done in Maya using the XROMM Maya Tools&nbsp

1)  Import bone and marker models

(Note: Depending on what method you used to get the bone models, the bone models can be in a different scale than the Maya scene. That results in animations were bones are misaligned or overlapping. One way to check that is to create the mayacams as for Rotoscoping and rotoscope one frame for one bone. Another way is to check scale against the grid.)

2)  Get marker coordinates from the marker models

3)  Export the CT marker locator data


If you are using XROMM_Maya_tools_2.0.5 or earlier, the window will look like this: 

  1. Export the CT marker locator data

Converting .wrl (VRML) models into Maya-friendly format (Windows only). Note: it is more convenient to export 3D models in .obj format from Amira (or Microscan Tools) because .obj files can be imported directly into Maya. These instructions are provided in case only VRML models are available.

If using older SmoothData MATLAB script, then Reset Bone element pivots(**this step omitted if using rigidBody MATLAB script)

  1. Select all marker locators for single bone (using shift select for multiple selection)
  2. Shift select the bone associated with the selected locators
  3. click the mvPv button on the XROMMtools shelf
  4. repeat for each bone