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The Wrapper Material can be used to specify additional surface properties per material.

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The Wrapper material settings are organized in Basic and Advanced modes. You can switch the mode from the toggle button () under the Preview Swatch or globally from the Configuration rollout of the Settings tab. 

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The context options of the Color Slot allow to Copy and Paste a color from one color slot to another, as well as to reset the color selection.

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A Reset option is provided in the context menu of each Number Slider. You can reset the slider value to the default one.

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||V-Ray Asset Editor|| > Materials (right-click) > Wrapper

||V-Ray Asset Editor|| > Materials Create Asset (left-click) Materials Wrapper



Parameters

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Some options are available only in Advanced mode.

Base material – Specifies the surface material.

Alpha contribution  – Determines the appearance of the object in the alpha channel of the rendered image.

Normal (1) – A value of 1.0 means the alpha channel is derived from the transparency of the base material.
Ignore in Alpha (0)   A value of 0.0 means the object does not appear in the alpha channel at all and shows the alpha of the objects behind it.
Black Alpha (-1) – A value of -1.0 means that the transparency of the base material cuts out from the alpha of the objects behind. Matte objects are typically given an alpha contribution of -1.0. Note that this option is independent of the Matte surface option (i.e. a surface can have an alpha contribution of -1.0 without being a matte surface).

Ignore Objects in Secondary – When enabled, no other scene objects are reflected or refracted by this material. All reflection and refraction rays instead sample the corresponding environment color or texture.

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