Virtual markers calculated from 6DOF data

The 6DOF bodies can be used to calculate virtual markers in relation to the 6DOF position. These markers are calculated both in real-time and in a file, and can then be exported and analyzed like any other marker. To virtual markers have the type Virtual in the Trajectory info window and the residual is always 0. The trace of a virtual marker is a dotted line just like trace of a gap-filled part.

There are two different ways of creating virtual markers:

• Virtual point in 6DOF body definition
  The virtual trajectory of the virtual point is calculated as soon as the 6DOF body has data, i.e. there must be at least 3 real markers in a frame to calculate the virtual marker. To make a point virtual in the 6DOF body definition you just select the checkbox in the Virtual column of the Rigid bodies list, see chapter Rigid bodies.
  To get the desired virtual position you can either put a temporary marker in the correct position when creating the body and then remove the marker when making the measurement. Or you can add the point with the Add Point option on the 6DOF bodies page and enter its position manually.

• Virtual trajectory part in gaps of 6DOF marker
  The virtual trajectory part is calculated when a real marker is lost and the Calculate missing markers in rigid bodies option on the 6DOF bodies page is activated. There must be at least 3 real markers left in the 6DOF body to calculate the virtual marker in a frame.