4. Origin Point Calibration
Last updated
Last updated
For existing calibration files, without calibrating the entire motion capture system (i.e., without performing T-shaped calibration), you can perform L-shaped calibration individually to update the coordinate system origin. After the calibration is complete, the original position of the coordinate system origin in the 3D view will be updated.
Before calibrating the origin, please determine the new origin position. Place the L-shaped calibration rod in the motion capture area. In the 2D view, at least 25% of the cameras should be able to completely capture all four marker points on the L-shaped rod. There should not be any noise points in the 2D view except for the four marker points on the L-shaped rod.
Open the calibration panel, select "Origin Calibration, " click on the gear icon to open calibration settings, and set the type of L-bar used for this origin calibration. Do not modify the "Calibration Axis"(8.4.1);
Close the origin calibration settings and click the "Origin Calibration" button at the bottom of the calibration panel. After calibration is completed, click the "Finish" button and save the calibration file separately. If you need to recalibrate, click the "Reset Calibration" button.
Refer to the L calibration steps in section "VIII. (ii) Basic Calibration" of this manual.
Switch to the 3D view; the origin position will update to the location where the L-bar is placed.
Enable Custom Origin Calibration
When you enable custom origin calibration, the software will freeze the current frame, and the 3D interface will display the frozen status.
Select Points to Determine Coordinate Axes and Origin:
Select the First Point: Choose a point in the 3D view. The software will freeze this point and recognize it as the origin. At this time, the calibration panel will display the XYZ position information of this point.
Select the Second Point: Continue to select another point in the 3D view. This point will be used to determine the long-axis direction. Similarly, the calibration panel will update and display the XYZ position of the newly selected point.
Select the Third Point: Select another point. This point is used to determine the short-axis direction. Each time you select a point, the calibration panel will display its XYZ coordinates in real time.
Click the L Calibration Button After Selecting Points in the 3D View
When selecting the remaining points, you can hold down the CTRL key to perform multi - point selection operations. This can improve the selection efficiency. If a total of four points are selected, the software will execute the origin calibration operation.
Custom origin calibration must involve point selection; otherwise, the calibration cannot be completed.
During the point selection process, ensure that the selected points can accurately represent the required origin and coordinate axis directions. Otherwise, it may lead to inaccurate calibration results.
