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Entertainment Marker Sets
There are two different Skeleton marker templates that can be used for entertainment applications: Baseline and Core. Both of these Marker Sets provide high-quality tracking, but the Core marker set templates may provide more stable tracking for high-camera count systems.
Among these marker sets, some of the placements are shared. For example, the Baseline (41) Marker Sets serves as a starting point, and the other baseline Marker Sets add more markers to it. When attaching the markers, you should reference the Skeleton avatar from the Builder pane for relative locations. The following charts and pages provide additional descriptions to where each marker should be placed, find related markers or click on one of the baseline Marker Sets pages for specific placement descriptions.
Asymmetry is the key to avoiding the congruency for tracking multiple Marker Sets. When there are more than one similar marker arrangements in the volume, marker labels may be confused. Thus, it is beneficial to place segment makers — joint markers must always be placed on anatomical landmarks — in asymmetrical positions for similar rigid bodies and skeletal segments. This provides a clear distinction between two similar arrangements. Furthermore, avoid placing markers in a symmetrical shape within the segment as well. For example, a perfect square marker arrangement will have ambiguous orientation and frequent mislabels may occur throughout the capture. Instead, follow the rule of thumb of placing the less critical markers in asymmetrical arrangements.
List of Baseline marker set templates
List of Core marker set templates
Front view of the Baseline (37) Marker Set.
Back view of the Baseline (37) Marker Set.
Note that the waist markers are the key markers in modeling the pelvis bone, which is the major segment governing the other subsequent Skeleton segments. For best results, avoid placing the waist markers in a rectangle shape. When tracking multiple actors with similar proportions, introduce an offset to one of the WaistBack marker, or the WaistCMarker (included only with the 13 additional Marker Set), to create an asymmetrical arrangements.
When placing the shoulder markers, ask the actor to stand in the T-pose in order to place the markers on accurate locations. It could also be helpful to ask the actor to do few rounds of arm abduction and adduction to palpate for the shoulder axis. These markers determine the width of the shoulder and respective relationship with the upper arm segment.
For best results, place the hand markers so that the shape of the marker arrangement is asymmetrical itself and also unique to the shape on the other hand. Since the wrist marker placement is fixed along the wrist axis, offset the HandOut or the HandIn markers to create the unique arrangements. For more robust and simple tracking, hand rigid-bodies can be attached on the hand to replace the markers and guarantee the asymmetrical and non-deforming marker placement.