Sunlight (mr Sun) Parameters

Adjusts settings for the "mr Sun" sun light.

Basic Parameters group

On
Turns the "mr Sun" light on or off. Default=on.
Multiplier
A scalar multiplier for the intensity of the sunlight. Default = 1.0.
Targeted

Applicable only when the "mr Sun" light was added directly to the scene via Create panel Lights Photometric, rather than as part of a Daylight system. 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 checkbox. When off, you can set this value directly.

Shadows group

On
Toggles whether the light generates shadows. Default=on.
Softness
Sets 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.
Softness Samples
The number of samples used to generate soft shadows. If set to 0, no shadows are sharp-edged.

Sky Parameters group

Inherit from mr Sky
When on, uses the equivalent settings from the mr Sky component of the current Daylight system to override the remaining mr Physical Sky parameters, except for Aerial Perspective. Default = on, which is recommended.

For a description of the settings that become available when you turn off "Inherit From mr Sky," see mr Physical Sky Rollout.

Photons group

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.
Radius
Sets the radial distance from the target in which the mr Sun casts GI photons.
Setup Date, Time & Location

Click to display the Motion tab of the 3ds Max Design command panel, where you can set the date, time, and location.