MarkerPCA¶

MLModule¶

genre	`Marker`
author	`MeVis Medical Solutions AG`
package	`MeVisLab/Standard`
dll	`MLGeometry1`
definition	MLGeometry1.def
keywords	`XMarker`, `main`, `axis`, `bounding`, `box`

Purpose¶

The MarkerPCA module does a principal component analysis (PCA) on the 3D positions of the markers. The resulting eigenvectors and eigenvalues are sorted so that the largest eigenvalue comes first.

Input Fields¶

inMarkerList¶

name: inMarkerList, type: XMarkerList(MLBase)¶: The input markers list.

For accessing this object via scripting see the Scripting Reference: MLXMarkerListWrapper.

Parameter Fields¶

Field Index¶

`Center`: `Vector3`	`Update`: `Trigger`
`Center Of Mass`: `Vector3`	`Valid`: `Bool`
`Longest Axis`: `Vector3`
`Longest Extent`: `Float`
`Middle Axis`: `Vector3`
`Middle Extent`: `Float`
`Shortest Axis`: `Vector3`
`Shortest Extent`: `Float`

Visible Fields¶

Longest Axis¶

name: longestAxis, type: Vector3, persistent: no¶: The longest axis (normalized).

Middle Axis¶

name: middleAxis, type: Vector3, persistent: no¶: The middle axis (normalized).

Shortest Axis¶

name: shortestAxis, type: Vector3, persistent: no¶: The shortest axis (normalized).

Longest Extent¶

name: longestExtent, type: Float, persistent: no¶: The extent along the longest axis.

Middle Extent¶

name: middleExtent, type: Float, persistent: no¶: The extent along the middle axis.

Shortest Extent¶

name: shortestExtent, type: Float, persistent: no¶: The extent along the shortest axis.

Center¶

name: center, type: Vector3, persistent: no¶: The center (aka midpoint). This can be used to calculate/render the object aligned bounding box by adding/subtracting the axes multiplied by half their extent.

Center Of Mass¶

name: centerOfMass, type: Vector3, persistent: no¶: The center of mass (aka barycenter)

Update¶

name: update, type: Trigger¶: If triggered, the PCA is calculated.

Valid¶

name: valid, type: Bool, persistent: no¶: Indicates if the results are currently valid.