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Render Passes (AOVs)

AOVs, otherwise known as Render PassesRender passes allow a rendered frame to be further broken down beyond the capabilities of Render Layers. Render Passes vary among render engines but typically they allow an image to be separated into its fundamental visual components such as diffuse, ambient, specular, etc.. segregates the different aspects of the scene, rendering each aspect across multiple images. This is useful in fine-tuning projects, compositing, and creating detailed and photorealistic images.

To instruct OctaneRender^® to include a particular pass, go to the Octane Render Target node and click on the AOVs tab to select the pass (Figure 1).

Figure 1: The Render Passes tab in an Octane Render Target node

There is an Options tab in addition to the individual AOV tabs.

• Cryptomatte Bins - Determines the number of Cryptomatte bins to render.
• Cryptomatte Seed Factor - Specifies the amount of samples to use for seeding cyrptomattes. This number is multiplied by the amount of bins.
• Max Info Samples - Determines the maximum number of samples for the Info passes.
• Info Sampling Mode - Enables motion blur, depth of fieldThe distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions. source: wikipedia (https://en.wikipedia.org/wiki/Depth_of_field), and sets pixel filtering modes.
  • Distributed Rays: Enables motion blur, DOFThe distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions. source: wikipedia (https://en.wikipedia.org/wiki/Depth_of_field), and pixel filtering.
  • Non-Distributed with Pixel Filtering:Disables motion blur and DOF, but leaves pixel filtering enabled.
  • Non-Distributed without Pixel Filtering: Disables motion blur, DOF, and disables pixel filtering for all AOVs except for render layer mask and ambient occlusion.
• Info Opacity Threshold - Geometry with an opacity equal to or higher than this value will be treated as completely opaque.

The AOVs are classified into the following sub-categories:

• Beauty
• Volume
• Info
• Denoised
• Auxillary
• Crytomatte
• Render LayersRender layers allow users to separate their scene geometry into parts, where one part is meant to be visible and the rest of the other parts “capture” the side effects of the visible geometry. The layers allow different objects to be rendered into separate images where, in turn, some normal render passes may be applied. The Render layers are meant for compositing and not to hide parts of the scene.
• Custom
• Global Texture
• Light
• Light Direct
• Light Indirect

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