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The Render Channels Container allows you to extract one or more render elements from the final image.   

Lighting – The diffuse direct surface lighting.   

Specular – The surface specular highlights.

Self Illumination – The self-illumination of the surface.

GI – The diffuse surface global illumination.

Refraction – The refractions on the surface.

Background – The image background as set in the project, with the rest of the image rendered as black.

Reflection – The reflections on the surface.

Diffuse – The pure diffuse surface color.

Shadows – The diffuse light that was blocked by other objects.

Atmosphere – Atmospheric effects.

Sample Rate – Shows an image where the pixel brightness is directly proportional to the number of samples taken at this pixel.

Bump Normal – The normals generated by bump maps.

DR Bucket – Allows you to extract an image which shows which bucket was rendered by which machine during distributed rendering.

Normals – The surface normals.

Material ID – Provides a mask for individual objects and materials that are easy to select in compositing software. 

Material ID (no AA) – Provides a mask for individual objects and materials that are easy to select in compositing software. 

Render ID  – Creates selection masks based on the node handle of each object.

MultiMatte Materials  – Creates red, green and blue selection masks based on the ID Number set within the V-Ray material.