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LPVR works with both transmission types Multicast and Unicast. Multicast requires you to set the multicast group (multicast IP).
HMD Marker Setup
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Note that if you have a pre-configured target from Optitrack, you don’t need to do a manual adjustment. You only need to do this if you have a custom target attached to your HMD. The axis alignment might not be correct for pre-defined. Please check that the axis alignment corresponds to what is shown in the SteamVR coordinate system image above. |
Attachment
When manually positioning the appropriate location of the rigid body pivot point, you will need to have landmark markers on specific locations. When attaching retroreflective markers, make sure markers are securely attached and readily captured by the cameras. For attaching the markers, we recommend using Optitrack’s M4 markers and metal poles.
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Set the pivot point over the landmark marker. Use the Set Pivot Point to Selected Marker feature to assign the pivot point to the marker. This will set the elevation of the pivot point along the eye-level (Figure 4, Figure 5).
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Place the pivot point at the midpoint between the two markers. In Motive enable Two Marker Distance visual aid from the perspective pane, and select the two landmark markers in Motive. This will provide a distance between two markers. Then, using this information, translate the pivot point laterally by half of the distance so that it is placed right on the midpoint between two markers (Figure 6).
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Translate the pivot point along the z-axis using the translation tool. For the most accurate position, you may need to physically measure the sagittal, z-axis, distance from the landmark marker to the root of nose and apply the measured offset (Figure 7, Figure 8).
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Orientation
Now that you have translated the pivot point, you need to make detailed adjustments to the orientation using the orientation transformation tool. For best results, align the two front markers along the x-axis grid and roughly center the rigid body along the z-axis grid. Then, check to make sure that each of the rigid body orientation axes is parallel to the grids lines in Motive. If there is any deviation, apply rotation to adjust the offset. If needed, transparency of the axes and the grids can be adjusted from the Application settings. Align the axes to match the OpenVR coordinate system as shown in Figure 9.
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Once you have the rigid body asset for the HMD configured, you can export the asset into a TRA file for future uses. Importing the TRA file (e.g. CV1.tra) will load the rigid body (HMD) asset and make it available for use; however, the marker placement must remain unchanged to re-load previously created rigid bodies.
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