2011

Table Of Contents
the photometric sun; the color is computed automatically based on the time,
date, and location specified in the drawing. The color is determined based on
the position in the sky. When the workflow is generic or standard lighting
(the LIGHTINGUNITS system variable is set to 0), the additional sun and sky
properties are unavailable.
The properties of the sun can be modified by using the SUNPROPERTIES
command. The Sun Properties window is displayed. The details of the settings
are located under SUNPROPERTIES in the Command Reference.
The rays of the sun are parallel and have the same intensity at any distance.
Shadows can be on or off. To improve performance, turn off shadows when
you dont need them. All settings for the sun except geographic location are
saved per viewport, not per drawing. Geographic location is saved per drawing.
The angle of the light from the sun is controlled by the geographic location
you specify for your model and by the date and time of day. These are
properties of the sun and can be changed in the Sun Properties window and
the Geographic Location dialog box. The time zone used is based on the
location, but you can adjust it independently (TIMEZONE system variable).
Sky Background
The option to choose the sky background is only available when the lighting
unit is photometric (the LIGHTINGUNITS system variable is set to 1 or 2). If
you choose the sky background and change the lighting to standard (generic)
lighting (the LIGHTINGUNITS system variable is set to 0), the sky background
is disabled.
The sun and sky background can be interactively adjusted in a view that can
be activated in the Sun Properties window by clicking the first button in the
title bar of the Sky Properties. This button activates the Adjust Sun & Sky
Background dialog box. Here you can change properties and preview the
changes to the background.
Show Me: Adjust Sky Properties
Click the Play arrow to start the animation.
Sky Illumination
The view can have a sky background or a sky background and illumination.
This option is in the Sky Properties Status drop-down list in the Sun Properties
Sun and Sky Simulation | 2057