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In the Node Graph, right-click on the DlSettings node and choose Show Parameters in Floating Pane.

Right-click the DlSettings node in the Node Graph and select Preview Render. 

3Delight Display will open and show the rendering as it progresses.

In 3Delight Display, display the contact sheet by double-click the layers icon in the Thumbnail View or by choosing View → Contact Sheet.

All rendered layers are shown. You can see one layer per entry picked in the Multi-light list, in addition to the primary RGBA layer. Pick any layer to display it in full size by clicking on it. You can also use the page up and page down keys to cycle through the layers.  

Select the primary RGBA layer to continue.

In KATANA, double-click on the GafferThree node.

In the parameters section, unfold the rig node to display all three lights in the scene. Note their current intensity values.

Back in 3Delight Display, open the preferences by choosing File → Preferences...

In the Preferences window, pick the General tab. Make sure the Enable interactive adjustments of lights in the scene is enabled.

Close the Preferences dialog.

Bring up the Mixer by choosing Edit → Mixer...

The Mixer displays a list of lights that matches the selected entries in the Multi-LIght list of the rendering attributes.

• Clicking on the solo gadget of a given light or rig will change the rendered image to show only that light's contribution to the rendering. At most one Mixer item can set as solo.
• Clicking the check box gadget will toggle that light or light rig contribution to the rendered image on or off.
• The Luminosity slider acts as an exposure on the light or light rig contribution to the rendered image.
• The colour picker acts as a multiplier to the light source or light rig colour.