---
title: "Capture the required movement"
canonical: "https://help.vicon.com/space/Nexus216/11610129/Capture%20the%20required%20movement"
format: markdown
---
After you have calibrated the labeling skeleton for your subject (see [Calibrate a labeling skeleton](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11602491)), you can capture the required trials.

You can stream motion data in real time and/or capture raw camera data for offline processing. You can capture a trial manually (see below), or configure Nexus to start/stop capture automatically (see [Automatically start and stop capture](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11599898)).

To quickly capture sequences of trials using the same setup information for each trial, see [Use Simple Capture Mode](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11602508).

> ℹ️ **Note**   
> ℹ️ For clarity, reconstruction and labeling are described as separate steps. However, if you want to run reconstruction and labeling as soon as each trial has been captured, you can add these operations (and any others that you want to run automatically) to a post-capture pipeline that runs as soon as capture finishes. For more information see step 7 below.

Before capturing a movement trial, ensure that you have already:

- Created or opened a session in the database in which you want to store the trial data, and ensured that it is the active session. For more information, see [Prepare a data management hierarchy to store your files](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11608239).
- Loaded an existing .vsk file for the subject whose motion is to be captured. If you have just created your VSK (see [Calibrate a labeling skeleton](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11602491)), the correct VSK is already loaded. If not, in the **Subjects Resources** pane, click the **Load an existing subject** button > Macro (inline-media-image)

 and open the required .vsk file.

- Attached the Vicon markers to the subject in accordance with the marker arrangement used in the labeling skeleton (.vsk) file (if you are using Plug-in Gait, see [Attach Plug-in Gait markers to a patient](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11607783)).

> ✅ ** Tip**   
> ✅ If you are using Plug-in Gait, Vicon recommends that you do not remove the heel markers for the movement trials. Their presence does not affect the calculated output from Plug-in Gait, but it does improve the reliability of the automatic labeling in Nexus.

**To capture movement trials:**

1. In the **Resources** pane, ensure Nexus is in **Live** mode.
2. Display a **3D Perspective** view.
3. In the **Capture Tools** pane, select an existing capture configuration for the trial from the **Trial Type** list or save as a new one.
4. In the **Next Trial Setup** section, complete the details for storing your trial data in the active session.  
:warning: **Naming sessions and trials**: When you enter a name in the Trial Name field, do not give the trial the same name as the session as this can cause confusion when you select files in Data Management and may also cause issues if your Vicon Nexus system includes FLIR cameras.  
In the **Data Source Setup** section, ensure **Optical Camera Data,** **Video Camera Data**, and **Device Data** are selected as required.
5. If you want capture to start and/or stop automatically, specify the required settings in the **Auto Capture Setup** section. (For more information, see [Automatically start and stop capture](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11599898).)
6. If you are conducting clinical gait trials for kinetic analysis involving one or more force plates and want Nexus to automatically assess whether the foot is correctly positioned and is producing valid data for your live trials, ensure that in the **Options** dialog box (F7), **Footstrikes** is selected. For more information, see [Automatically assess foot strikes](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11601057).
7. In the **Post-Capture Pipeline Setup** section, specify any pipelines containing operations to be run automatically on the trial data when the capture is complete. (For example, if you are using Plug-in Gait, you could select **Run pipeline after capture** and then select the **Reconstruct And Label** and **Plug-in Gait Dynamic** pipelines. This automatically reconstructs and labels the data and then runs filtering, event detection, modeling and export operations.) However, to start with, you will probably prefer to leave this option cleared, so that you can run each operation separately and observe their effects.
8. In the **System Resources** tree, select **Local Vicon System** and then in the** Properties** pane, in the **General** section, set **Processing Output Level** to **Labels**.
9. In the capture volume, have the subject perform the movement that is to be captured.   
Nexus automatically reconstructs, labels, and fits the Vicon labeling skeleton created in the previous stage (see [Prepare a subject](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11608510)) to the subject in real time.
  :check_mark: **Tip**: If a labeling error is obvious or persistent, restart the labeler by right-clicking **Local Vicon System** node and then clicking **Reboot Core Processor** (CTRL+R).
  If the subject steps on the force plates, the force vector is also shown in real time.
10. On the **Capture Tools** tab, unless you have specified a time or trigger on which to start capturing (see step 5), in the **Capture** section, click **Start** to begin capturing and in the capture volume, have your subject wearing the appropriate marker set for your VST perform the required motion.
11. Unless you have specified a time or trigger on which to stop capturing in the **Auto Capture Setup** section, when the subject has completed the required motion, click **Stop**.  
If you specified a post-capture pipeline (see step 7), Nexus automatically switches to **Offline** mode, displays the subject data in the **3D Perspective** view, and automatically performs any operations contained in any pipelines selected in the **Post-Capture Pipeline Setup** section. Otherwise the system remains Live, ready to capture the next trial.
  :check_mark: **Tip**: If events are not automatically detected, or are only partially detected, you will need to add them manually (see [Add events to trials](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11608258)). You will probably need to do this in situations such as: trials without force plates; movements that are not on a flat surface, such as stepping up/down/over, climbing, etc; pathological or non-cyclical gait movement.
12. Repeat steps 9–11 until you have obtained the required number of trials.

You can now reconstruct and label the trials. For more information, see [Reconstruct and label movement trials](https://vicon-help.atlassian.net/wiki/spaces/Nexus216/pages/11607362).