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The Erase Under Button: Erase Under Objects
This command will erase the intersection area of non-selected objects
with selected objects. The selected objects are not affected. This
allows non-Manhattan holes to be cut in dark areas, for example.
Suppose one needs a circular hole in a ground plane. Using this
command, the task is simple. One would create the disk on some
arbitrary layer where the hole is desired, select it, press Erase
Under, then the Delete key to erase the disk object.
If in layer-specific mode, only the current layer is erased, others
are untouched. Otherwise, all unselected geometry is affected.
Stephen R. Whiteley
2006-10-23