2011

Table Of Contents
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.
solid history A property of a solid that allows you to see and modify the
original forms of the solid.
solid object An object that represents the entire volume of an object, for
example a box.
solid primitive A basic solid form. Solid primitives include: box, wedge, cone,
cylinder, sphere, torus, and pyramid.
spatial index A list that organizes objects based on their location in space. A
spatial index is used 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.
spline-fit Uses the vertices of the selected polyline as the control points, or
frame, of a curve approximating a B-spline. This curve, called a spline-fit
polyline, passes through the first and last control points unless the original
polyline was closed.
split face A mesh face that has been subdivided along a specified vector.
STB file For plot style table file. Contains plot styles and their characteristics.
sub-prompt A command prompt that instructs for a form of input to complete
a command or alter a property.
subdivision A division, or tessellation in a mesh object. As a mesh object is
smoothed, the number of subdivisions increases.
subobject A part of a composite object.
surface A surface is a 3D object that is a thin shell. Surfaces do not have mass
or volume as 3D solids do. There are 3 types of surfaces: analytic, generic, and
NURBS.
1030 | Glossary