2009

Horizon Blur The blurriness with which the horizon is rendered.
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.
TIP Some sky models neglect the influence of bounce light from the ground,
assuming only the sky is illuminating the scene. To compare the output of mr Sky
with, for example, the IES Sky light, set Ground Color to black.
Night Color The minimum color of the sky: The sky will never become darker
than this value. It can be useful for adding things like moon, stars, high-altitude
cirrus clouds that remain lit long after sunset, etc. As the sun sets and the sky
darkens, the contribution from Night Color is unaffected and remains as the
base light level.
Red/Blue Tint Gives artistic control over the redness of the light. The default
value of 0.0 is the physically correct value (calculated for a 6500K whitepoint),
but can be changed with this parameter, which ranges from 1.0 (extremely
blue) to 1.0 (extremely red).
Saturation Also an artistic control, where 1.0 is the physically calculated
saturation level. The parameter ranges from 0.0 (black and white) to 2.0
(extremely boosted saturation).
mr Sun
Daylight system > Modify panel > Daylight Parameters rollout > Sunlight
drop-down list > mr Sun
The mr Sun light is intended for use in the mental ray Sun & Sky combination.
This topic mainly provides information on parameters unique to this
component. A number of mr Sky parameters are common to all three Sun &
Sky components. For some of those parameters, this topic provides a brief
explanation plus a link to the main topic with additional details.
TIP You can view the Sun & Sky combination in a viewport, which makes adjusting
parameters fully interactive. For details, see
this procedure on page 5167.
Sunlight and Daylight Systems | 5173