====== Computing the Dimensions of the CalTester Rod ======

The dimensions of the CalTester Rod can be computed from Motion Data using the Functional Joints Landmarks.\\


{{:CalTesterToolbar.jpg}}\\
Select the CalTester Dimensions Icon from the Toolbar\\


{{:ComputeDimensionsPP.jpg}}\\


You will need to collect 2 movement trials in which the tip of the CalTester rod is secured into the plate divot for the entire trial. The movement is similar to the typical test movement of the CalTester Rod. One of the trials will have the top of the rod in the divot (e.g. down) and the other trial will have the bottom of the rod in the divot (e.g. down).

Switch to CalTester mode and open the two files (e.g. **CalTopDown.c3d** and **CalTopUp.c3d**)

Select the buttons for **Compute Top Tip** and **Compute Bottom Tip**\\


{{:ComputeCalTesterDimensionsPPResults.jpg}}\\


Select **Merge Landmarks From the Two Trials**\\


Select **Modify the Rod Dimensions**\\


if you switch to the Dimensions Tab, you will see the updated results\\


{{:CalTesterDimensionsPPresults.jpg}}\\


Note that this test was done using the MTD2 rod. Notice that the dimensions are not identical with the [[CalTester:Documentation:MTD3|Default Dimensions]] because of limitations in the motion capture system and in the functional joints calculation.