23. A series of coordinated can be edited at once. In the attributes panel, choose a 'Y' coordinate of any of the points and press the Fill Values button...
...to show the Fill Values dialog. Check the coordinate is set to 'Y' and enter '1' into the edit box.
Press the OK button and the 'Y' coordinate of each point will be now set to 1.
The points will update accordingly in the graphics window.
Creating Image Planes >>>