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The relative zero position will be set automatically when you create a new point. You can use "Set Relative Zero" to set its location without creating a point. "Lock Relative Zero" will prevent it from automatically changing.
The relative zero position gives the job of vector addition to the program. So if we create a point at 10,20 and want the next point at vector 30,40 from the last point we can use the
@ symbol in the command line and enter
@30,40. The alternative would be doing the math and entering
|After pressing the icon, you can set the relative zero position the same way you would create a point.|
|After pressing the icon, the relative zero position will not change when creating new points.|
There is another command line use case: you want to create a point 50 units from the relative zero and turned 60 degrees around it. Again we use the
@ symbol and input
The direction in which angles are measured is shown at right.