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Lighting pass

A Lighting Pass isolates the contribution of a light source. Each light pass behaves as if all the other lights in the scene are switched off. The individual light passes can be added together to recreate the original render in post or to further adjust the individual contributions of each light during post. The light passes available are:

• Ambient light: Captures ambient light either from the sky in a daylight environment or from the texture in a texture environment.

• Sunlight: Captures the light contribution of the sun. Only useful when a daylight environment is configured.

• Light Pass 1-8: Light passes 1 to 8 capture the contribution from mesh emitters. Emitters (both texture and blackbody) have a light pass ID pin assigning an emitter to a light pass. It’s possible to assign multiple emitters to the same light pass. If nothing is configured, all emitters contribute to light pass 1.

To use light passes in OctaneRender, each light emitter needs to be identified and mapped to the desired light pass. This can be done by assigning the Light Pass ID in each of the emission nodes that are in the scene (Figure 1).

Figure 1: Assign Light pass ID in the emission nodes

In the next example the 3 globes have their own Light pass ID assigned. The middle one has Light Pass ID 2

Figure 2: Shows the chosen enabled Render Pass ‘Light Pass 2’ and the setup light pass ID for the emission node.

Figure 3: The left image is the Beauty Pass and the right image is the Light Pass 2.

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