HAS-Motion Software Documentation

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projecting a marker onto a line

there are many cases in which it is convenient to project a marker onto a line. one particularly useful scenario is to project a marker placed laterally on the shoulder at the level of the humeral head onto a line passing vertically through a marker on the acromium.

to create the landmark, switch to model builder mode and click on add a new landmark.

create marker_projected:

click landmarks button

click add new landmark button

create landmark: marker_projected

landmark name: marker_projected

   define orientation using:
   starting point: marker1
   ending point: marker2
   lateral object: leave blank
   project from: marker3

do not check: offset by percent (1.0 = 100%)

check: calibration only landmark

this will create a marker that lies along the vector from marker 1 to marker 2.