Finger Marker Placement Instructions

Index	Name	Description
1	WristM	Position of the wrist center
2	WristIn	Inside of the wrist
3	WristOut	Outside of the wrist
4	HandOffset	Hand offset point, differentiate left and right hand
5	FingerThumb1	Between the palm and the first phalanx of the thumb
6	FingerThumb2	Between the first and second phalanx of the thumb
7	FingerThumb3	Between the second and third phalanx of the thumb
8	FingerThumb4	Tip of the thumb
9	FingerIndex1	Between the first phalanx of the index finger and the palm
10	FingerIndex2	Between the first and second phalanx of the index finger
11	FingerIndex3	Between the second and third phalanx of the index finger
12	FingerIndex4	Tip of the index finger
13	FingerMiddle1	Between the first phalanx of the middle finger and the palm
14	FingerMiddle2	Between the first and second phalanx of the middle finger
15	FingerMiddle3	Between the second and third phalanx of the middle finger
16	FingerMiddle4	Tip of the middle finger
17	FingerRing1	Between the first phalanx of the ring finger and the palm
18	FingerRing2	Between the first and second phalanx of the ring finger
19	FingerRing3	Between the second and third phalanx of the ring finger
20	FingerRing4	Tip of the ring finger
21	FingerPinky1	Between the first phalanx of the pinky finger and the palm
22	FingerPinky2	Between the first and second phalanx of the pinky finger
23	FingerPinky3	Between the second and third phalanx of the pinky finger
24	FingerPinky4	Tip of the pinky finger

Real Finger Marker Point Diagram

Marker Application Instructions

1.Refer to the marker placement diagram in Figure 1 above, and attach reflective markers to each joint of the fingers. Special attention shall be paid to the placement position of the handoffset marker: For the left hand: place it beneath FingerIndex1, between FingerIndex1 and WristM; For the right hand: place it beneath FingerRing1, between FingerRing1 and WristM. 2.When initially building the hand model, lay the palm flat within the capture volume (the hand may be rested on a fixed platform for easier model creation). Align all fingers parallel to the positive Y-axis of the global coordinate system (with the Z-axis pointing upward), and keep the thumb naturally abducted. 3. 3 mm markers are adopted for all finger markers.

Joint Description

No.	Bone Name	Parent Index	Number of Children
1	Hand	—	6
2	HandThumb0	0	3
3	HandThumb1	1	2
4	HandThumb2	2	1
5	HandThumb3	3	1
6	HandThumbEnd	—	0
7	HandIndex0	0	3
8	HandIndex1	1	2
9	HandIndex2	2	1
10	HandIndex3	3	1
11	HandIndexEnd	—	0
12	HandMiddle0	0	3
13	HandMiddle1	1	2
14	HandMiddle2	2	1
15	HandMiddle3	3	1
16	HandMiddleEnd	—	0
17	HandRing0	0	3
18	HandRing1	1	2
19	HandRing2	2	1
20	HandRing3	3	1
21	HandRingEnd	—	0
22	HandPinky0	0	3
23	HandPinky1	1	2
24	HandPinky2	2	1
25	HandPinky3	3	1
26	HandPinkyEnd	—	0

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Coordinate System Specification

The coordinate systems for each finger joint bone under Model Pose are defined as follows:

In the initial pose, the coordinate system of the Hand joint is aligned with the motion capture coordinate system. The coordinate systems of all remaining finger joints shall be adjusted according to the actual marker placement, such that the positive Y-axis is parallel to the vector originating from the marker of the current bone and pointing toward the marker of its child joint.