--- title: "Set up the volume" canonical: "https://help.vicon.com/space/Tracker41/14322550/Set%20up%20the%20volume" format: markdown --- After you have completed a wand wave (see [Perform a wand wave](https://vicon-help.atlassian.net/wiki/spaces/Tracker41/pages/14322153)), the next step is to [set the volume origin](#SetVolumeOrigin). Depending on your capture environment (for example, if your volume floor is not perfectly level), you may then need to set the floor plane. To further help with setting up your system, you may also want to set the floor grid and/or autonumber the cameras. > Macro (scroll-only) > > > Macro (toc) > Macro (scroll-pagebreak) ## > Macro (anchor) Set the volume origin After you have captured a wand wave, you set the volume origin and axes so the cameras and volume in Tracker reflect the actual positions of the cameras in relation to your defined coordinate system, as well as to each other. 1. To enable you to see the axes in relation to the volume, in the **Workspace**, change the view to **3D View**. 2. Place the calibration device on the volume floor in the position you want the volume origin to be and in the orientation you want the axes to be (reflected in the axes displayed in the **3D View**. - X axis: red line - Y axis: green line - Z axis: blue line 3. In the **Camera Calibration** panel, to the right of **Wand Wave**, ensure Advanced Parameters > Macro (inline-media-image) is selected and in the wand list, ensure the appropriate Active Wand is selected (normally Active Wand v2). :check_mark: **Tip**: Using a Vicon Active Wand enables you to set up your volume coordinate system quickly and easily. However, using a larger calibration object (for example, markers embedded in the volume floor and wall) can improve calibration stability and consistency over time, particularly in larger volumes. For more information, see [Create a custom calibration object](https://vicon-help.atlassian.net/wiki/spaces/Tracker41/pages/14320634/Work+with+objects). 4. In the **Volume Setup** section, click **Start Set Origin**. The button displays**Set Origin ** and is unavailable until Tracker has enough data to set the origin. If you need more information about why the button is unavailable, hover the mouse pointer over the button to view its tooltip. For more information, see [About collecting frames](#AboutCollectingFrames). 5. Click **Set Origin**. 6. In the **3D View**, ensure that in the **View Filters** options, **Cameras** is selected. In the **3D View,** **Perspective** view, all of the cameras shift as a group, so the origin of the volume is aligned with the wand. #### > Macro (anchor) About collecting frames If Tracker detects an issue with setting the origin, the tooltip for the **Set Origin** button displays the following information in the format 'Collecting frames (*reason origin can't be set*)' so that you can take the appropriate action: > Macro (scroll-tablelayout) | **Tooltip text (reason)** | **Action** | | --- | --- | | L-Frame motion detected | Ensure the calibration object remains motionless while you are setting the origin. | | No labeled data | Nothing is being tracked in the volume. If you are using an active wand, ensure the wand is switched on. If the wand LEDs are blinking, switch to Continuous mode. | | L-Frame not tracked | The chosen calibration object was not detected. If you are using an active wand, ensure the wand is switched on. If the wand LEDs are blinking, switch to Continuous mode. | | Multiple objects detected | Remove any extra objects that are being tracked in the volume. | | Insufficient frames | The calibration object hasn't been tracked in enough frames yet. Check that the L-frame is being tracked consistently. | ## Set the floor plane The final stage in calibrating your Vicon cameras is to set the floor plane, using markers in the volume to automatically define it. While this step is optional, it is recommended as it will help ensure the tracking floor plane aligns with the physical floor plane across the tracking volume. The position of the virtual floor that is derived during origin setting process is extrapolated from the position of the wand in relation to floor of the volume. As the wand is a small object compared with the size of the volume, any slight discrepancy from the wand being level has a large effect over the rest of the volume when you set the origin. To account for any discrepancy, you set a floor plane, which takes a much larger area into account, so that the virtual floor lines up correctly with the actual floor plane. **To set the floor plane:** 1. Ensure you have completed the rest of the camera calibration procedure and set the origin (see [Set the volume origin](#SetVolumeOrigin)). 2. Turn off the wand or remove it from the volume. 3. Scatter a quantity of the same size Vicon markers across the floor of your capture volume. If you want Tracker to automatically recognize these markers as floor plane markers, ensure that they outnumber any other groups of markers (e.g, markers on a wand or markers that were used to focus cameras, etc). 4. Check to make sure the **Height offset (mm)** parameter is specified correctly. If you need to change this value setting, see [Adjust the Set Floor Plane settings](#AdjustFPSettings). 5. In the** Camera Calibration** panel, ensure that to the right of **Volume Setup**, Advanced Parameters > Macro (inline-media-image) is selected, expand the **Set Floor Plane** section and then click **Start Set Floor Plane**. The button displays **Set Floor Plane**. 6. After a few seconds, click **Set Floor Plane**. In the **3D View**, ensure that in the **View Filters** options, **Cameras** is selected. In the **Perspective** view, notice that the cameras shift as a group slightly along one or more rotation axes to better reflect an average of the markers scattered across the floor, taking into account any offsets that you specified. #### > Macro (anchor) Adjust the Set Floor Plane settings When setting the floor plane, Tracker uses the center of all markers it has identified as being in the same plane. As the center of the marker is actually above the ground, you will need to specify an offset or else your floor plane (and Global Origin) may be higher than desired. To specify the proper offset, in the **Camera Calibration** panel, to the right of **Volume Setup**, ensure its Advanced Parameters > Macro (inline-media-image) are selected, expand the **Set Floor Plane** section and change the **Height offset** value to an appropriate value. The **Height offset** is the amount (in mm) by which to adjust the floor plane (the default is 7 mm). ![image](media://c42a7263-47f9-4d2d-8ed7-29c448d31ed7) > ✅ ** Tip** > ✅ In general, to calculate the **Height offset**, add the radius of the markers to the thickness of the base of the marker. For a typical hard-based marker, this would give a Height offset of 9 mm (7 mm radius + 2 mm base thickness). ## Set the floor grid To more accurately visualize the dimensions of your volume in Tracker, you can change the size and shape of the floor grid. To do this: 1. In the **Camera Calibration** panel, to the right of **Volume Setup**, ensure Advanced Parameters > Macro (inline-media-image) is selected. 2. Expand the **Set Floor Grid**section and change the values (in mm) to produce the required result. 3. Click **Set Floor Grid**. ## > Macro (anchor) Autonumber cameras The **Auto Number Cameras** feature numbers the currently connected Vicon cameras in ascending order, according to their position in the volume. You may want to do this after you calibrate your Vicon system, so that your cameras are logically numbered before you begin tracking. Automatic numbering starts with the camera that is furthest from the volume origin. The cameras are then numbered in a clockwise direction around the volume. If your cameras are positioned at different levels, the cameras in the level that contains the most cameras are numbered first. **To automatically number Vicon cameras:** 1. Ensure that the cameras are positioned as required, and that you have calibrated the cameras and set the volume origin. 2. To enable you to check the camera numbering for all cameras, in the **System** panel, ensure that you can see the list of Vicon cameras. 3. In the **Camera Calibration** panel, to the right of **Volume Setup**, ensure Advanced Parameters > Macro (inline-media-image) is selected, and in the **Auto Number Cameras** section click **Auto Number Cameras**. The cameras are automatically numbered in ascending order, according to their position in the volume. 4. In the volume, check that the cameras are now numbered as required by hovering your cursor over one of the cameras.