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The Visibility by Ray Type attributes.


Camera
Shadow
Diffuse
Specular
Reflection
Refraction

Defines if the assigned objects will be visible to rays of the specified type. By default, all objects are visible to all rays, except light sources added through the Gaffer Three nodes , which are invisible to camera rays by default. Note that for these light sources offer their own control over this default value; more details This can be adjusted for each light using its Visible to Camera parameter offered in the light's Object Parameters tab. More details is available under the page dedicated to a given light type under the Lights section.

Object is Matte

When this attribute is on, the attached objects act as a matte holdout. Matte objects are not shaded and behave as if they were completely opaque, hiding any objects behind them, but appear in the image as transparent black pixels. This attribute is off by default.