An object's local coordinate system (LCS) is the transform from the object's segmented image frame to its local coordinate system (as if you were traveling from the segmented frame to the LCS). This LCS is stored in the subject file and should be defined before tracking in X4D or Locate3D. This is necessary because the tracking output for each X-ray frame is the transformation from the X-ray lab frame to the object's LCS.

Orient3D's Local Coordinate System widget allows users to create an LCS for each object in their data set.

Orient3D's LCS algorithms are implemented in a dll plugin framework, so it is possible to write your own and plug it into Orient3D. The currently implemented algorithms are: Vertebra [Anderst], Distal Femur [Miranda], and Proximal Tibia [Miranda]. See the documentation for more details.

The Visual3D panel can be opened by checking its checkbox. This panel allows users to create an LCS using Visual3D's method of defining proximal and distal joints with targets. Consult the Visual3D documentation for details on this method.

There are three methods of defining an LCS, as described in the How To: Define the LCS of an Object tutorial.

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