Redraws the current viewport or a specified object (entity) in the current viewport
(redraw [ename [mode]])
If redraw is called with no arguments, the function redraws the current viewport. If called with an entity name argument, redraw redraws the specified entity.
The redraw function has no effect on highlighted or hidden entities; however, a REGEN command forces the entities to redisplay in their normal manner.
If ename is the header of a complex entity (a polyline or a block reference with attributes), redraw processes the main entity and all its subentities if the mode argument is positive. If the mode argument is negative, redraw operates on only the header entity.