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visual3d:documentation:modeling:segments:create_coda_pelvis_relative_to_anatomical_landmarks

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visual3d:documentation:modeling:segments:create_coda_pelvis_relative_to_anatomical_landmarks [2024/06/14 17:24] – created sgrangervisual3d:documentation:modeling:segments:create_coda_pelvis_relative_to_anatomical_landmarks [2026/06/09 21:22] (current) – Cleaned up section levels and added links. wikisysop
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-|**Language:**|** English**  • [[index.php?title=Segment_Examples_4/fr&action=edit&redlink=1|français]] • [[index.php?title=Segment_Examples_4/it&action=edit&redlink=1|italiano]] • [[Segment_Examples_4/pt|português]] • [[index.php?title=Segment_Examples_4/es&action=edit&redlink=1|español]] ****|+====== How to create a CODA pelvis relative to anatomical landmarks ======
  
-|===== Contents =====\\ \\ \\ \\ * [[#Step_1._Confirm_the_subject_metric_containing_the_marker_radius.|1 Step 1. Confirm the subject metric containing the marker radius.]]\\ * [[#Step_2._Create_landmarks_for_the_ASIS_markers|2 Step 2. Create landmarks for the ASIS markers]]\\ * [[#Step_3._Create_a_CODA_Pelvis|3 Step 3. Create a CODA Pelvis]]|+The [[visual3d:documentation:modeling:coordinate_system|segment coordinate system]] for the [[visual3d:documentation:modeling:segments:coda_pelvis|CODA pelvis]] is the mid-point between the ASIS markers. The anatomical landmarks are actually posterior to the ASIS markers because the motion capture system tracks the centre of the marker.
  
-Create CODA pelvis relative to anatomical landmarks. +===== Correcting the CODA definition =====
- +
-The segment coordinate system for the CODA pelvis is the mid-point between the ASIS markers. The anatomical landmarks are actually posterior to the ASIS markers because the motion capture system tracks the center of the marker.+
  
 This is a modest error, but it can be corrected by creating landmarks that are posterior to the ASIS markers by the radius of the motion capture marker. This is a modest error, but it can be corrected by creating landmarks that are posterior to the ASIS markers by the radius of the motion capture marker.
  
-==== Step 1. Confirm the subject metric containing the marker radius. ====+==== Step 1. Confirm the subject metric containing the marker radius ====
  
-If the metric doesn't exist, create a new metric. +If the metric doesn't exist, create a new metric. Switch to **Subject Data/Metrics** TAB.
- +
-Switch to **Subject Data/Metrics** TAB. +
- +
-[[File:SegmentExample4_1.png|{{/images/c/c4/SegmentExample4_1.png?391x491}}]]\\+
  
 +{{:SegmentExample4_1.png}}
  
 Select **Add New Item** and enter in the name **Marker_Radius** and the value. Select **Add New Item** and enter in the name **Marker_Radius** and the value.
  
-[[File:SegmentExample4_2.png|{{/images/7/7a/SegmentExample4_2.png?581x334}}]]\\+{{:SegmentExample4_2.png}}
  
- +In this example, the marker has a diameter of 1.2 cm. Visual3D uses [[visual3d:documentation:pipeline:model_based_data_commands:units_of_measurement|MKS units]], so the value is 0.006 meters. **NOTE**: If the radius is not consistent with your marker radius, modify the value.
-In this example, the marker has a diameter of 1.2 cm. Visual3D uses MKS units, so the value is 0.006 meters. +
- +
-**Note:** If the radius is not consistent with your marker radius, modify the value.+
  
 ==== Step 2. Create landmarks for the ASIS markers ==== ==== Step 2. Create landmarks for the ASIS markers ====
  
-[[File:SegmentExample4_4.png|{{/images/1/1e/SegmentExample4_4.png?381x401}}]]\\+{{:SegmentExample4_4.png}} {{:SegmentExample4_5.png}}
  
- +**NOTE**: the Medial-Lateral (ML) Edit box contains the [[visual3d:documentation:pipeline:expressions:expressions_overview|expression]] **-MARKER_RADIUS** to define the offset.
-**Note:** the ML Edit box contains the expression **-MARKER_RADIUS** +
- +
-[[File:SegmentExample4_5.png|{{/images/d/d6/SegmentExample4_5.png?381x396}}]]\\ +
- +
- +
-**Note:** the ML Edit box contains the expression **-MARKER_RADIUS**+
  
 ==== Step 3. Create a CODA Pelvis ==== ==== Step 3. Create a CODA Pelvis ====
  
-[[File:SegmentExample4_6.png|{{/images/a/a2/SegmentExample4_6.png?380x360}}]]\\+Follow the usual steps to create a CODA pelvis segment.
  
 +{{:SegmentExample4_6.png}}
  
 In this example, the locations defining the segment coordinate system for the pelvis are the landmarks **RT_ASIS** and **LT_ASIS**, and the marker **SACR** located at the midpoint of the PSIS markers. In this example, the locations defining the segment coordinate system for the pelvis are the landmarks **RT_ASIS** and **LT_ASIS**, and the marker **SACR** located at the midpoint of the PSIS markers.
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 The tracking markers are **RASI**, **LASI**, and **SACR**. The tracking markers are **RASI**, **LASI**, and **SACR**.
  
-[[File:SegmentExample4_7.png|{{/images/a/af/SegmentExample4_7.png?517x449}}]]\\ +{{:SegmentExample4_7.png}}
  
  
-Retrieved from "" 
  
  
visual3d/documentation/modeling/segments/create_coda_pelvis_relative_to_anatomical_landmarks.1718385868.txt.gz · Last modified: by sgranger