Differences

This shows you the differences between two versions of the page.

--- visual3d:documentation:modeling:segments:create_coda_pelvis_relative_to_anatomical_landmarks [2024/06/19 12:48] – sgranger
+++ visual3d:documentation:modeling:segments:create_coda_pelvis_relative_to_anatomical_landmarks [2026/06/09 21:22] (current) – Cleaned up section levels and added links. wikisysop
@@ Line 1: / Line 1: @@
-{{{{{{{{{{{{create coda pelvis relative to anatomical landmarks.
+====== How to create a CODA pelvis relative to anatomical landmarks ======
-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.
+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.
-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.
+===== Correcting the CODA definition =====
-==== step 1. confirm the subject metric containing the marker radius. ====
+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.
-if the metric doesn't exist, create a new metric.
+==== Step 1. Confirm the subject metric containing the marker radius ====
-switch to **subject data/metrics** tab.
+If the metric doesn't exist, create a new metric. Switch to **Subject Data/Metrics** TAB.
-segmentexample4_1.png\\
+{{: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.
+{{:SegmentExample4_2.png}}
-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.
+==== Step 2. Create landmarks for the ASIS markers ====
-in this example, the marker has a diameter of 1.2 cm. visual3d uses mks units, so the value is 0.006 meters.
+{{:SegmentExample4_4.png}} {{:SegmentExample4_5.png}}
-**note:** if the radius is not consistent with your marker radius, modify the value.
+**NOTE**: the Medial-Lateral (ML) Edit box contains the [[visual3d:documentation:pipeline:expressions:expressions_overview|expression]] **-MARKER_RADIUS** to define the offset.
-==== step 2. create landmarks for the asis markers ====
+==== Step 3. Create a CODA Pelvis ====
-segmentexample4_4.png\\
+Follow the usual steps to create a CODA pelvis segment.
+{{:SegmentExample4_6.png}}
-**note:** the ml edit box contains the expression **-marker_radius**
+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.
-segmentexample4_5.png\\
+The tracking markers are **RASI**, **LASI**, and **SACR**.
+{{:SegmentExample4_7.png}}
-**note:** the ml edit box contains the expression **-marker_radius**
-==== step 3. create a coda pelvis ====
-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.
-the tracking markers are **rasi**, **lasi**, and **sacr**.
-segmentexample4_7.png\\
-}}}}}}}}}}}}