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This tutorial illustrates how to render multiple light layers at once using 3Delight for KATANAKatana, and how this kind of rendering can be used in 3Delight Display to interactively adjust the scene light intensities. In this context, the modifications are instantly shown in the rendered image and are applied in on the scene light sources by KATANAKatana. The scene Katana project is available as a small package file here.(fixme: first step is to adjust the path of the abc file by double-clicking on the Alembic_In node at the top of the Node Graph. In the Parameters section, click the down arrow next to the abcAsset textfield; pick Browse and select the mv.abc file that is next to the katana scene file).
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The layers of a multi-light image. Rendering such an image requires about 12% more time than rendering the RGBA "beauty" layer alone.
Rendering a multi-light image in Katana
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| Double-click on the DlSettings node to display the 3Delight rendering attributes.
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In the Katana Preferences, make sure that the 3Delight Render View preference is is to either 3Delight Display or Both.
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This will ensure that 3Delight Display is launched upon rendering. We are going to use its Mixer feature a bit later. |
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| Click on the primary image layer In the Node Graph, double-click DlSettings to display its parameters. Expand Image Layers, then Multi-light settings. |
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| In the Multi-Light sectionLight. In the light list,select the light layers to be rendered. In this sample scene, the key lights are grouped in a rig. Rigs get their own entry multi-light list; selecting one rig in that list will render a layer containing all of the rig's lights. Independent lights are listed under the Lights section. |
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| Right-click the DlSettings node in the Node Graph and select Start a Preview Render by right-clicking the Render node and choosing Preview Render.
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3Delight Display will open and show the rendering as it progresses. |
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| In 3Delight Display, display the contact sheet by double-click the layers icon in the thumbnail view or clicking the image or its thumbnail.
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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 the primary rgba layer. Pick any layer Click on a layer in the contact sheet 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 Select the primary rgba layer to continue. |
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Light Mixing in 3Delight Display
3Delight Display's Mixer can be used to interactively adjust light intensities. The modifications are instantly shown in the 3Delight Display rendered image and applied on the light sources by Katana.
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| In KATANA, Katana double-click on the GafferThree node , which is just above the DlSettings node. In the parameters section, unfold the rig node to display all three lights in the scene. Note their current to edit its parameters. Note the current light intensity values. |
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| Back in 3Delight Display, open the preferences by choosing File → Preferences...
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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. |
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| Bring up the Mixer by choosing Edit → Mixer...
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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.
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| Drag one of the Luminosity sliders; you will see that the rendered image in 3Delight Display will conform to the modified intensity. Also notice that the The intensity values of the light(s) in KATANA will in Katana will change accordingly.
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