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Warning

This shader is considered deprecated and will be removed in a future release. You should use the Standard Surface shader instead. A conversion script that converts Standard shaders to Standard Surface shaders is available in the Arnold menu of MtoA.

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Due to the large number of controls, the Ai Standard shader is split up into several groups. The individual settings for each group are described in more detail in the pages below. 

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Info

A selection of preset material values can be found here. The The Maya material library can be found here.

 

Specularity vs Reflection

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It is generally recommended that you use Specular to control glossy specular reflections. The specular_roughness parameter of the Standard shader affects the blurryness of the specular reflections. In Arnold, this is called "glossy reflections", or also "specular reflections".

The Standard shader has a secondary layer of reflection, called simply "reflection", which is perfectly sharp and mirror-like.  It is only there for perfect mirrors or glass. Not for blurry effects. If you want blurry reflections only you should use Specular. The images below show specular reflections coming from a light source and mirror reflections coming from light reflecting off the surroundings.

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The Sky Dome light will also not appear in reflections of the Standard shader. It is recommended to use Specular in combination with the Sky Dome light. If you want reflections to appear then you should use the Sky shader with 'Visible in Reflections' enabled.

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Further information about physically based rendering in Arnold can be found here.