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In the Katana Preferences, make sure that the 3Delight Render View preference is is to either 3Delight Display or Both.

This will ensure that 3Delight Display is launched upon rendering. We are going to use its Mixer feature a bit later.

In the Node Graph, double-click DlSettings to display its parameters.

Expand Image Layers, then Multi-Light. In the light list,select the light layers to be rendered.

Start a Preview Render by pressing Control + P or by right-clicking the Render node and choosing Preview Render.

3Delight Display will open and show the rendering as it progresses.Preview renders can also be launched by selecting Render → Preview Render View Node from Katana's main menu.

In 3Delight Display, display the contact sheet by double-clicking the image or its thumbnail.

The Contact Sheet can also be displayed 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. Click on a layer in the contact sheet to display it in full size. You can also use the page up and page down keys to cycle through the layers.  

Select the primary rgba layer to continue.