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
You can view the
Sun & Sky combination in a viewport, which makes adjusting parameters
fully interactive. For details, see
mr Sun Basic Parameters
Turns the mr Sun light
on and off. Default=on.
A scalar multiplier for
the light output. Default=1.0.
Applicable only when
you add an mr Sun light directly to the scene via Create panel Lights Photometric, rather than as part of a
When on, the light is targeted and you can change the target distance
by moving the target. The distance between the light and its target
is displayed to the right of the check box. When off, you can set
this value directly. Default=on.
Toggles shadowing for
the light. Default=on.
The softness of shadow
edges. The default value of 1.0 accurately matches the softness
of real solar shadows. Lower values make the shadows sharper and
higher values make them softer.
The number of shadow
samples for the soft shadows. If it is set to 0, no soft shadows
are generated. Default=8.
Inherit from mr Sky group
Notemr Sun can inherit
parameters from mr Sky even if the latter is off.
- Inherit from mr Sky
Uses the equivalent settings
from the mr Sky Parameters rollout for the remaining mr Sun Parameters
rollout settings. Default=on.
For further information,
Nonphysical Tuning group
These controls are available
only when “Inherit From mr Sky” is off.
- Red/Blue Tint
Provides artistic control
over the redness of the sky 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).
Provides artistic control
over saturation of the sky light. The default value of 1.0 is the physically
calculated saturation level. Possible values range from 0.0 (black
and white) to 2.0 (extremely high saturation).
mr Sun Photons rollout
Use these settings to
focus global-illumination photons on an area of interest. For example,
if you’ve modeled a huge city as a backdrop, but are rendering only
a room interior, you probably don’t want mental ray to shoot photons
over the entire city, with the result that only a few will find
their way into the room.
- Use Photon Target
When on, uses the Radius
setting with respect to the light target.
Sets the radial distance
from the target in which the mr Sun casts GI photons.