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Render Passes

OctaneRender^® for Unity^® provides Render Passes that enable the rendering process to segregate 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. You can access the Render Passes rollout from the PBR Render Target (Figure 1).

Figure 1: Accessing Render Passes in a PBR Render Target

The passes are classified as:

• Beauty Passes- Provides a rendered view of the different aspects lighting the scene, such as shadows, highlights, reflections, illumination, and color. OctaneRender will render beauty passes together with the main beauty pass (the normal rendering), i.e. each one of these requires its own film buffer to store in addition to the main film buffer on the device.
• Denoiser Passes - NEEDS DESCRIPTION
• Post-Processing Passes- Provides a view of the post-processing effects on the scene. If the Post-Processing node is enabled and a post-processing effect is applied to the scene, the Post-Processing render pass negates these effects and separates itself from the main pass.
• Render Layer Passes- These passes allow further separation of scene assets placed on various render layers. Please see the Render Layers section for more detail.
• Lighting Passes- A light pass isolates individual light sources. Each light pass behaves as if all the other lights in the scene are switched off. OctaneRender adds the individual light passes together to recreate the original render in post, or to further adjust the individual contributions of each light during post.
  To use light passes in OctaneRender, you must identify each light emitter and map them to the desired light pass. You do this by assigning the Light Pass ID in each Emission node in the scene.
  

• Note: This can only be done in the OctaneVR^® Nodegraph Editor window.

• Info Passes- Provides views of the effects of the scene's normals, UVs, and geometric data. OctaneRender will render the info passes one-by-one using only one additional film buffer - either at the end, or when needed. This helps save GPU memory, and the passes are fast to calculate. You can adjust the Max Samples parameter without affecting the maximum samples set toward the final rendered image.
• MaterialThe representation of the surface or volume properties of an object. Passes - Include all characteristics associated with scene materials.

The classifications group similar scene components together to use in the compositing process (Table 1).

Table 1: Classification of Render Passes

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