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Enter the beam command.
Create 3 beams by clicking point 1, point 2, point 3 and point 4 in order.
Click the Local Undo command without exiting the beam command .
Point 4 will be undone and beam 3 will be deleted.
You can continue drawing beams by defining a new point, or exit the beam command by pressing the ESC key.
Usage step |
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Creating 3 beams by clicking 4 points  |
Undo last point and delete 3rd string with local undo command  |
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