Baseline Upper Body + Fingers (33)
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v2.3
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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.
WaistLFront WaistRFront
Pelvis
Placed the marker on the protruding bone located on the front of the pelvis (left/right anterior iliac spine bone). The prominence can be palpated from left and right side of the waist.
WaistLBack WaistRBack
Pelvis
Place the WaistLBack and WaistRBack markers above left/right hip; about 10 cm above the hip joint.
BackTop
Torso
Place the marker on the spine right below the neck. For best results, LUArmHigh-LShoulderBack-BackTop-RshoulderBack-RUArmHigh markers should align roughly in a straight line when the actor is in T-pose. Also, note that this marker must be placed at an elevation higher than the chest marker for the torso segment to be tracked properly.
Chest
Torso
Place the marker at the center of the sternum, about 5 cm below where the neck starts.
BackLeft BackRight
Torso
These two markers are located symmetrically on each side of the back, slightly below the lowest end of the shoulder blade (scapular bone).
LShoulderBack RShoulderBack
Shoulder
Place the marker on the shoulder joint (glenohumeral joint) on the back.
LShoulderTop RShoulderTop
Shoulder
Place the marker at the top of each shoulder where you can palpate the protruding bone, which is usually located just before where the upper arm start when in T-pose. More specifically, the prominence is on the distal end of the clavicle bone (acrominoclavicular joint).
HeadTop
Head
Place the marker on the head tip.
HeadFront
Head
Place the marker at the center of the forehead.
HeadSide
Head
Place the marker on the either side of the head, slightly above the ear. When capturing multiple actors with similar proportions, place the marker on opposite side for clearer distinction.
LElbowOut RElbowOut
Upper Arm
Place the marker on the lateral side of the elbow joint, slightly towards the upper arm. More specifically, on the lateral epicondyle of the distal end of the humerous. Ask the actor to flex and extend the arm few times to confirm that markers are placed along the elbow axis and maintain stationary throughout the range of motion cycles.
LUArmHigh RUArmHigh
Upper Arm
Place the marker on the back of the upper arm near the groove between the triceps. For best results, LUArmHigh, LShoulderBack, BackTop, RshoulderNack, and RUArmHigh should align roughly in a straight line when in T-pose.
LFArm RFArm
Forearm
Place the marker on the front side of the forearm while in T-pose. For best results, slightly offset the left and right forearm markers to introduce the asymmetry on each side.
LWristOut RWristOut
Fore Arm / Hand
This marker is not included in the finger markersets. Place the marker on the outside (lateral side) of the wrist axis. (distal end of the radius bone). Note that the wrist axis is not always located on the protruding bone but 1-2 cm more towards the hand.
LThumb RThumb
Hand
Place the marker on the side of the thumb joint.
LIndex RIndex
Hand
Place the marker on the side of the index finger joint (proximal interphalangeal joint).
LPinky RPinky
Hand
Place the marker on the side of the pinky finger joint (proximal interphalangeal joint).
LHandIn RHandIn
Hand
Place the marker on the knuckle of the index finger, but slightly towards the side.
LHandOut RHandOut
Hand
Place the marker on the knuckle of the pinky finger, but slightly towards the side.
When placing the shoulder markers, ask the actor to stand in the 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.
Finger markersets include extra markers on the fingers, and the finger tracking is done by analyzing the kinematics of the hand and estimating the pose of each finger. The WristIn marker is removed and replaced by a forearm marker. Attaching finger markers uses mocap Velcro gloves and hand markers, which can be found from our .
