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This page gives some basic details about the Refraction Render E= lement and how it is used in compositing.
The Refraction Render Element stores refraction information calculated f= rom materials =E2=80=93 such as glass or water =E2=80=93 that refract objec= ts behind them in the camera's view. This means the brightness, coloration,= etc. of the refractions can be adjusted without the need to rerender.
Any material in a scene that has a value set for its Refraction paramete= r will generate refraction information that can be seen in this render elem= ent. A surface with no refraction values set in its material(s) will contai= n no information in the render element and therefore render black.
The Refraction Render Element is a key component in the main Beauty Element and can easily be used to cont= rol the refractions in the Beauty composite.
The Refraction Render Element itself is already a composite of the vrayRE_Raw_Refraction render eleme= nt multiplied by the Refractio= n Filter render element. When finer control over refractions is needed = in the composite, add these additional two channels to the output along wit= h the vrayRE_Refraction render element channel.
The parameters for this render element appear in the Attribute Editor un= der Extra V-Ray Attributes.
Enabled =E2=80=93 When enabled, the render element= appears in the V-Ray Virtual Frame Buffer.
Deep output =E2=80=93 Specifies whether to in= clude this render element in deep images.
Filename suffix =E2=80=93 The text added to the en= d of the rendered file, when saved as a separate file (e.g. myrender.refrac= t.vrimg).
Apply color mapping =E2=80=93 Applies the col= or mapping options specified in the Color mapping rollout of the VRay tab in the Render Settings window to this render e= lement. This option is enabled by default.
Denoise =E2=80=93 Enables the render element'= s denoising, provided the Denoiser render element is present.
The Refraction Render Element is useful for changing the appearance of r= efractive elements in a rendered image, by using a compositing or image edi= ting application. Below are a couple of examples of possible uses.
Refraction Render Element
Original Beauty Composite
Brightened Refraction Render Element
Brightened and tinted Refraction Render Element
Brightened Refractions
Brightened and Tinted Refractions
= vrayRE_Raw_Refraction x Re= fraction Filter =3D vrayRE_Refraction