2011

horizontal landing An optional line segment connecting the tail of a leader line with the
leader content.
Illuminance In photometry, illuminance is the total luminous flux incident on a surface
per unit area.
indirect bump scale Scales the effect of the base material’s bump mapping in areas lit by
indirect light.
indirect illumination Illumination techniques such as global illumination and final
gathering, that enhance the realism of a scene by simulating radiosity, or the interreflection
of light between objects in a scene.
initial environment The variables and settings for new drawings as defined by the default
drawing template, such as acad.dwt or acadiso.dwt. See also template drawing.
interface element A user interface object that can be customized, such as a pull-down menu
or tool set.
interpolation points Defining points that a B-spline passes through. See also approximation
points and fit points.
island An enclosed area within another enclosed area. Islands may be detected as part of
the process of creating hatches, polylines, and regions. (BHATCH, BOUNDARY)
ISO For International Standards Organization. The organization that sets international standards
in all fields except electrical and electronics. Headquarters are in Geneva, Switzerland.
isometric snap style A drafting option that aligns the cursor with two of three isometric
axes and displays grid, making 2D isometric drawings easier to create.
landing The portion of a leader object that acts as a pointer to the object being called out.
A landing can either be a straight line or a spline curve.
landing gap An optional space between a leader tail and the leader content.
layer A logical grouping of data that are like transparent acetate overlays on a drawing. You
can view layers individually or in combination. (LAYER)
layout The environment in which you create and design paper space layout viewports to
be plotted. Multiple layouts can be created for each drawing.
layout viewports Objects that are created in paper space that display views. See also paper
space. (VPORTS)
leader tail The portion of a leader line that is connected to the annotation.
1610 | Chapter 51 Glossary