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Type – Specifies the image sampler type. Depending on this choice, an additional rollout will open opens up below the Image sampler (Antialiasing) rollout with specific settings for that sampler type.

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None – A render mask is not used.
Texture – Render mask is a texture. Black values in the map define pixels which are not rendered. Pixels with any other values are rendered. The texture should use the screen mapping type.
Selected
– Only pixels that belong to the currently selected object(s) are rendered. V-Ray will still calculate calculates the entire image, but will only render renders parts that belong to the selected object(s). This mode is useful if you want to isolate or re-render just some objects from the scene.
Include/Exclude list
 – Same as Selected, but objects are selected by list.
Layers
– Renders only objects that belong to the currently selected layer.
Object
IDs – Renders only objects with specified Object IDs. Separate Object IDs with a comma (,).

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Min shading rate – Controls the number of rays shot for Anti-aliasing (AA) versus rays for other effects like glossy reflections, GI, area shadows, etc. This setting is especially useful with the Progressive image sampler. Higher values mean that less time will be is spent on AA, and more effort will be is put in the sampling of shading effects. For more information, see the Min Shading Rate Example.

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Divide shading subdivs – When enabled, for each image sample V-Ray divides the number of samples for lights, materials, etc. by the number of AA samples in order to achieve roughly the same quality and number of rays when changing AA settings. For example, if you have 4 AA subdivs (=16 image samples) and 8 light subdivs (=64 shadow rays), V-Ray will trace traces 4 (=64/16) shadow rays for each image sample. This also means that in order to sample a particular blurry effect with more than one sample, its subdivs must be increased above (sometimes far above) those of the image sampler. However, some users (especially those coming from other render engines) might find this automatic division inconvenient. When this option is disabled, the subdivs of lights, materials, etc. specify the number of subdivs for each image sample, thus allowing for more precise control of the sampling for these effects. With this option disabled, the above settings of 4 AA subdivs and 8 light subdivs will trace up to 1024 (=16*64) shadow rays, although V-Ray will still try tries to reduce that amount depending on the Global DMC sampler settings.The Min. shading rate parameter continues to be valid for convenience.

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