---
title: "Check video overlay"
canonical: "https://help.vicon.com/space/ShogunMarkerless121/1253507265/Check%20video%20overlay"
format: markdown
---
After you have completed the previous steps in the [Calibrate cameras](https://vicon-help.atlassian.net/wiki/spaces/ShogunMarkerless121/pages/1253507088) section, you can check that your video calibration is accurate by viewing a video overlay.

**To check a video overlay:**

1. In the **System** panel, in the **Vicon Markerless Cameras** section, select one or more Vanguard cameras.
  The **Cameras** view displays the video data for the selected camera(s).
2. In the **Cameras** view, select **View Filters** and in the **3D Data** section, make sure the **3D** option is selected.
  In the view pane, a 3D overlay is displayed. Because this displays a flat overlay on a **3D View**, the edges appear distorted.
3. To remove the distorted appearance, select **Distort 3D**. The 3D view is flattened to match the video.
4. If your Vicon system includes optical cameras, you can check that the video and the 3D View line up accurately.  
:check_mark: **Tip**: To check your calibration, from **View Filters**, under **Data**, select **Camera Rays**. If you select one or more cameras, this displays lines (rays) to everything the selected camera(s) can see. If you select one or more markers, this option displays lines from all cameras that can see the selected marker(s).