2004

856 | Glossary
RGB For red, green, and blue. A system of defining colors by specifying percentages of
red, green, and blue.
rubber-band line A line that stretches dynamically on the screen with the move-
ment of the cursor. One endpoint of the line is attached to a point in your drawing,
and the other is attached to the moving cursor.
running object snap Setting an Object Snap mode so it continues for subsequent
selections. See also Object Snap mode and object snap override.
(OSNAP)
save back To update the objects in the original reference (external or block refer-
ence) with changes made to objects in a working set during in-place reference editing.
script file A set of AutoCAD commands executed sequentially with a single SCRIPT
command. Script files are created outside AutoCAD using a text editor, saved in text
format, and stored in an external file with the file extension .scr.
selection set One or more selected objects that a command can act upon at the same
time.
shortcut keys Keys and key combinations that start commands; for example,
CTRL + S saves a file. The function keys (F1, F2, and so on) are also shortcut keys. Also
known as accelerator keys.
shortcut menu The menu displayed at your cursor location when you right-click
your pointing device. The shortcut menu and the options it provides depend on the
pointer location and other conditions, such as whether an object is selected or a
command is in progress.
slide file A file that contains a raster image or snapshot of the objects displayed in
the drawing area. Slide files have the file extension .sld. (MSLIDE, VSLIDE)
slide library A collection of slide files organized for convenient retrieval and display.
Slide library names have the extension .slb and are created with the slidelib.exe utility.
smooth shading Smoothing of the edges between polygon faces.
snap angle The angle that the snap grid is rotated.
snap grid The invisible grid that locks the pointer into alignment with the grid
points according to the spacing set by Snap. Snap grid does not necessarily correspond
to the visible grid, which is controlled separately by GRID. (SNAP)
Snap mode A mode for locking a pointing device into alignment with an invisible
rectangular grid. When Snap mode is on, the screen crosshairs and all input
coordinates are snapped to the nearest point on the grid. The snap resolution defines
the spacing of this grid. See also Object Snap mode. (SNAP)
snap resolution The spacing between points of the snap grid.
spatial index A list that organizes objects based on their location in space. AutoCAD
uses a spatial index to locate what portion of the drawing is read when you partially
open a drawing. Saving a spatial index with a drawing also enhances performance
when working with external references. The INDEXCTL system variable controls
whether layer and spatial indexes are saved with a drawing.
specular reflection The light in a narrow cone where the angle of the incoming
beam equals the angle of the reflected beam.
STB file For plot style table file. Contains plot styles and their characteristics.