Chapter 3 Customized Kinematic Model Creating Custom Mark Sets and Using VICON Autolabel Function to...
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Transcript of Chapter 3 Customized Kinematic Model Creating Custom Mark Sets and Using VICON Autolabel Function to...
Chapter 3 Customized Kinematic Model
Creating Custom Mark Sets and Using VICON Autolabel Function to Generate a Model Designed by You
• Marker names and placement specific to your own model
• Create different displays with custom linkages
• Add additional objects into an existing .mkr file
3.1 Why Customize?
• At least 3 marks should be placed on a single segment
• All marks on a segment should NOT be set on a line
• Usually, put a mark on each distal and primal end of a segment (joint centers) to shape the segment
3.2 Essentials of Mark Setting
3.3 Format of .mkr File
• Simple text file, can be created with notepad
• Specialized header
• Sections distinguished by square brackets
Sample.mkr
!MKR#2
[section 1]
Marker1 Description1
[section 2]
Etc…
• Labels
• Linkages
• Grouping (definitions of joints and segments)
• Hierarchy (model definition)
3.4 Essential Sections in a .mkr file
• .Mkr file consists of labels which can be assigned to markers
• Labels have custom linkages drawn by the author which may or may not be significant to the model
• Any label can be assigned to any marker
Labels vs. Markers
• First column: marker name
• Second column: description (optional)
Declaring Markers
!MKR#2
[labels]
RFHD Right Front Head
LFHD Left Front Head
RBHD Right Back Head
LBHD Left Back Head
Drawing Linkages
• Listing markers draws lines between every possible marker
LASI,RASI,LPSI,RPSI
Drawing Linkages
• Listing only two markers per line allows custom displays
LASI,RASIRASI,RPSIRPSI,LPSILPSI,LASI
The Autolabel Section
• Format of section is important
• Groupings declared
• Root grouping = grouping with the most markers or grouping named as “root”
• Root grouping should be rigid (i.e pelvis)
• Groupings are linked as a segmental hierarchy
Declaring a Grouping
Head = LFHD,RFHD,LBHD,RBHD
Thorax = C7,T10,CLAV,STRN,LBAK,RBAK
LeftShoulder = LSHO,CLAV,T10
LeftUpperArm = LSHO,LUPA,LELB
LeftLowerArm = LELB,LFRA,LWRA,LWRB
LeftHand = LFIN
Linking the Hierarchy
Head,Thorax
Thorax,Pelvis
Pelvis,LeftUpperLeg
Pelvis,RightUpperLeg
LeftLowerArm,LeftHand
RightLowerArm,RightHand