Beauty Passes

Beauty Passes provide a rendered view of different aspects lighting the scene such as shadows, highlights, reflections, illumination, and color. Beauty passes are rendered together with the main beauty pass.

Beauty Passes can be accessed from the Render Toolbar > 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.. button > Beauty and Post Proc tab.

Beauty Pass Parameters

Raw - Changes the beauty passes so they become raw render passes. This is done by dividing out the color of the BxDF of the surface hit by the camera ray. You can composite these passes together by multiplying the raw pass with its matching filter pass:

DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. = diffuse filter * diffuse raw
Reflection = reflection filter * reflection raw
Refraction = refraction filter * refraction raw
TransmissionA surface characteristic that determines if light may pass through a surface volume. = transmission filter * transmission raw

The following Beauty Passes are available:

Emitters - Contains all samples where the camera ray hits an emitter.
Environment - Contains all samples where the camera ray doesn't hit anything.
Diffuse - Contains all samples where a diffuse material is lit either directly or indirectly.
Diffuse Direct - Contains all samples where a diffuse material is directly lit.
Diffuse Indirect - Contains all samples where a diffuse material is indirectly lit.
Diffuse Filter - The diffuse texture color of the material.
Reflection - Contains all samples where either direct or indirect light is reflected directly or indirectly.
Reflection Direct - Contains all samples where direct light is reflected.
Reflection Indirect - Contains all samples where indirect light is reflected (GI).
Reflection Filter - The reflection texture color of the material.
Refraction - Contains all samples where the camera ray was refracted.
Refraction Filter - The refraction texture color of the material.
Transmission - Contains all samples where the camera ray is transmitted.
Transmission Filter - The transmission texture color of the material.
Subsurface ScatteringDefines how fast light gets scattered when traveling through the medium. - Contains all samples where scattering happened in the volume visible from the camera ray.
Shadow Pass - Contains the shadow pass applied to the beauty pass.
Irradiance - Contains the irradiance on the surface.
Light Direction - Estimates the dominant direction from where most of the light is coming.
Volume - Contains all samples that scattered in a volume.
Volume Mask - Contains absorption color and the contribution amount of a volume sample. This is a multiplication pass, so to composite volume passes you should be doing something like allOtherBeautyPasses * volumeMask + volume + volumeEmission
Volume Emission - Contains all samples where the camera ray hit a volume emitter.
Volume Z-depth Front - Contains the front depth of all volume samples.
Volume Z-depth Back - Contains the back depth of all volume samples.
Noise - Contains the noise estimate value when Adaptive SamplingA method of sampling that determines if areas of a rendering require more sampling than other areas instead of sampling the entire rendering equally. is used. Green indicates the noise estimate is less than the threshold and considered clean.

Compositing

The following formula can be used to reconstruct the Beauty Pass:

Render Result = Diffuse Direct + Diffuse Indirect + Reflection Direct + Reflection Indirect + Refraction + Transmission + Subsurface Scattering + Emitters + Environment (with Alpha ChannelA greyscale image used to determine which areas of a texture map are opaque and which areas are transparent. enabled)

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