2009

Scale The size of the sun disk.
Use Custom Background Map When on but no background map is specified,
the background of the rendering is transparent black, suitable for external
compositing. If you supply a background shader by clicking the button and
then specifying a map or shader, the background of the rendering will come
from that shader (for example, a texture map that uses a background
photograph). In either case the mr Physical Sky will still be visible in reflections
and refraction.
To apply a map or shader to this parameter, click the None button.
NOTE The background area in the rendered image's alpha channel is always fully
transparent, as is the case in general in 3ds Max.
Inherit from mr Sky Uses the equivalent settings from the mr Sky Parameters
rollout for the remaining mr Physical Sky Parameters rollout settings, except
for Aerial Perspective. Default=on.
For further information, see
Common Parameters on page 5164.
Haze The amount of particulate matter in the air. Possible values range from
0.0 (a completely clear day) to 15.0 (extremely overcast, or a sandstorm in the
Sahara). Default=0.0.
For details, see Haze on page 5172.
To apply a map or shader to this parameter, click the None button.
Horizon and Ground group
Horizon Height The vertical position of the horizon. Default=0.0.
For details, see
Horizon Height on page 5172.
Blur The blurriness with which the horizon is rendered. Default=0.1.
At 0.0 the horizon is completely sharp. Generally only values lower than 0.5
are useful, but the full range is up to 10.0 for a horizon that consists of blur
only, with no actual horizon at all.
Ground Color The color of the virtual ground plane. Note that this is a diffuse
reflectance value (that is, albedo). The ground appears as a Lambertian reflector
with this diffuse color, lit by the sun and sky only, and does not receive any
shadows.
To apply a map or shader to this parameter, click the None button.
5184 | Chapter 18 Lights and Cameras