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gizmo A tool that permits you to manipulate a 3D object uniformly or along a specified
axis or plane. Examples of gizmos include the 3D Move, 3D Rotate, and 3D Scale gizmos.
They are displayed when you select a 3D object.
global illumination An indirect illumination technique that allows for effects such as color
bleeding. As light hits a colored object in the model, photons bounce to adjacent objects
and tint them with the color of the original object.
Gooch shading A type of shading that uses a transition from cool to warm colors rather
than from dark to light.
graphics area See drawing area.
graphics window See AutoCAD window and drawing area.
grid An area covered with regularly spaced dots or lines to aid drawing. The grid spacing is
adjustable. The grid dots are never plotted. See also grid limits. (GRID)
grid limits The user-defined rectangular boundary of the drawing area covered by dots
when the grid is turned on. Also called drawing limits. (LIMITS)
grip modes The editing capabilities activated when grips are displayed on an object:
stretching, moving, rotating, scaling, and mirroring.
grip tool An icon that you use in a 3D view to easily constrain the movement or rotation
of a selection set of objects to an axis or a plane. (3DMOVE, 3DROTATE)
grips Small squares and triangles that appear on objects you select. After selecting the grip,
you edit the object by dragging it with the pointing device instead of entering commands.
ground plane The XY plane of the user coordinate system when perspective projection is
turned on. The ground plane displays with a color gradient between the ground horizon
(nearest to the horizon) and the ground origin (opposite the horizon). See also sky and
underground.
guide curves Lines or curves that intersect each cross section of a lofted solid or surface and
that define the form by adding additional wireframe information to the object. (LOFT)
2658 | Chapter 52 Glossary