2012

Table Of Contents
heads-up display (HUD)
The process of transparently displaying user interface elements on top of or
over the drawing area without obscuring the view of the objects drawn on
the drawing area.
helix
An open 2D or 3D spiral. (HELIX)
Help menu
In AutoCAD for Mac, you can find Help on the Mac OS menu bar or by pressing
Fn-F1.
HLS
For hue, lightness, and saturation. A system of defining color by specifying the
amount of hue, lightness, and saturation.
Home view
A special view saved with the drawing that is controlled through the ViewCube
tool. The Home view is similar in concept to the default, initial view presented
when a drawing is first opened.
horizontal landing
An optional line segment connecting the tail of a leader line with the leader
content.
hot grip
A selected grip.
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 materials 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.
846 | Glossary