This page provides information on the the Refraction Render Element.
The Refraction Render Element stores refraction information calculated from materials, such as glass or water, that refract objects 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 parameter generates refraction information that can be seen in this render element. A surface with no refraction values set in its material(s) does not contain information in the render element, and therefore renders black.
The Refraction Render Element is a key component in the main Beauty composite process and can be easily used to control the refractions in the Beauty composite.
The Refraction Render Element itself is already a composite of the Refraction Shading render element multiplied by the Transparent Color (RefractionFilter) render element. When finer control over refractions is needed in the composite, add these additional two channels to the output along with the VRayRefraction render element channel.
||Render Elements panel|| > Shading rollout > Transparent Shading - Refraction
The Refraction Render Element is useful for changing the appearance of refractive elements after rendering in a compositing or image editing application. Below are a couple of examples of possible uses.
Raw Refraction x Refraction Filter = Refraction
The Raw Refraction render element is currently not supported in V-Ray for Modo. Users can generate a Raw Refraction element manually in compositing by dividing the Refraction render element by the Refraction Filter render element.
Refraction ÷ Refraction Filter = Raw Refraction
Denoise – Denoises the render element.