To identify the feature for the computation, you need to select a point within the white area on the launchpad. Try to select a point in the center of the area and try to click on the same point from both of the stations.
If you select a point not within the white area on the launchpad, then the resulting 3D point will be inaccurate, and you may send the robot flailing about in space, crashing into the ground, or hitting another object.
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