December 28, 2022 iRendercs

Working with Light Linking in Octane

Light linking determines whether or not certain objects and volumes in the scene will be affected, either individually or collectively, by lights, the sun, and other ambient lighting sources. All objects utilizing this feature must have the Octane Object tag. In the article today, let’s find out how to work with Light Linking in Octane

1. Setting up Light Linking

Any object must first have a “Octane Object Tag” before using Light Exclusion. Select the Object layer tab in the Octane Object Tag and change the “Use light pass mask” popup option to “Enable” to turn on Light Exclusion for the selected object. Through check boxes in the Light Pass Mask section turn down, it is possible to regulate the contribution of the Octane Daylight Sun, Environment, and up to 8 scene lights. Each light you want to include (or omit, depending on the menu item selected) needs to have its “Light pass ID” defined via the Octane Light Tag’s Light settings page. The Light pass ID edit box is located at the bottom of the tab. You must input a value between 1 and 8 in order to control lights using the ID.

2. Local Workflow

Scene Prep

There are two Octane lights in this scene (orange and cyan), two Dragon objects, HDR lighting, and Octane Daylight.

Set Light IDs

Enter “2” and “3” (without the quotations) in the Light pass ID edit boxes, as shown below, to establish the ID settings for the two lights. We’ll be able to keep the light away from the dragons in this way.

Set the dragon objects’ Octane Object Tag settings as shown below. For each dragon, select the “Octane Object Tag.” As illustrated below, select the Object layer tab and turn on the “Use Light Pass Mask” menu option.

Disable “2” in the “Light Pass Mask” section of the Dragon Objects by selecting “Octane ObjectTags.” Your Live Viewer’s display should be the same as the image below. Due to the exclusion of the light’s contribution, the Dragon item on the right is no longer impacted by Orange Light. Cyan Light is still illuminating our stuff, as you can see. The Cyan light will also be excluded if you disable 3.

Disable “2” in the “Light Pass Mask” section of the Dragon Objects by selecting “Octane ObjectTags.” Your Live Viewer’s display should be the same as the image below. Due to the exclusion of the light’s contribution, the Dragon item on the right is no longer impacted by Orange Light. Cyan Light is still illuminating our stuff, as you can see. The Cyan light will also be excluded if you disable 3.

Set Orange Light for Dragon 1 and Cyan Light for Dragon 2

Set the cyan light for the dragon 2 and the orange light for the dragon 1 this time. The outcome is seen in the image below.

Exclude both Lights from both Dragons

Orange and cyan light no longer illuminate these objects if “2” and “3” are activated from the object tags of the dragons.

Exclude environment illumination from Dragon 2

“Sun” (Octane Sun object) and “Environment” (HDR and Octane Sky) toggles are denoted by the letters “s” and “e,” respectively. Both of those are acceptable exclusions for your items. This time, choose the Dragon 2 object and remove the letters “e,” “2,” and “3,” respectively, from the object tag and Light pass mask areas. As shown in the image below, neither the ambient illumination nor any other lights have an impact on Dragon 2. (except daylight sun).

3. Global Workflow

In the scenario, light exclusion can also be managed worldwide. The Live Viewer => Settings => Kernels tab is where this is done. You can select the desired behavior by setting the Light IDs action menu in the Light section.

Turn off the cyan lighting for the scene and the dragons.

Set the “Lights ID Action” option to Disable in the Live Viewer => Settings => Kernels tab. As in the local workflow, the “Light IDs” are listed below that menu and can be activated or disabled for any defined light or light with the Light ID in the scene. When the “Cyan Light” from Light ID 3 is turned off, as shown in the image below, only the “Orange Light” and Environment will continue to shine and illuminate the items.

Change the Light IDs Action’s functionality from Disable to Enable; just the Cyan Light will now illuminate the scene and the objects. These lights can be enabled or disabled, just like the Octane Daylight sun and HDRI environment objects do. This is similar to local exclusion.

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Source: Source: docs.otoy.com

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