2011

Table Of Contents
LINEARBRIGHTNESS
Controls the brightness level of the viewport when using default lighting or
generic lights.
LINEARCONTRAST
Controls the contrast level of the viewport when using default lighting or
generic lights.
LOGEXPBRIGHTNESS
Controls the brightness level of the viewport when using photometric
lighting.
LOGEXPCONTRAST
Controls the contrast level of the viewport when using photometric lighting.
LOGEXPDAYLIGHT
Controls if the exterior daylight flag is enabled when using photometric
lighting.
LOGEXPMIDTONES
Controls the mid tones level of the viewport when using photometric lighting.
RENDERUSERLIGHTS
Controls whether to override the setting for viewport lighting during
rendering.
SUNSTATUS
Turns on and off the lighting effects of the sun in the current viewport.
Sun and Sky Simulation
The sun is a light that simulates the effect of sunlight and can be used to show
how the shadows cast by a structure affect the surrounding area.
Sun and sky are the primary sources of natural illumination in AutoCAD.
Whereas the rays of the sun are parallel and of a yellowish hue, the light cast
from the atmosphere comes from all directions and is distinctly bluish in
color. When the LIGHTINGUNITS system variable is set to photometric, more
sun properties are available.
When the workflow is photometric (the LIGHTINGUNITS system variable is
set to 1 or 2) the sun properties have more properties available and are rendered
using a more physically accurate sunlight model. The sun color is disabled for
2056 | Chapter 44 Add Lighting to Your Model