This page provides information on the Refraction Filter Render Element.
The Refraction Filter Render Element is an image that stores refraction information calculated from the materials' refraction values in the scene.
Materials with no refraction values appear as black, whereas refractive materials appear as white (maximum refraction) or gray (lesser amounts of refraction). If any hue (color) is specified in the material's Refractive Color parameter, that hue and value are represented here in the Refraction Filter. They are also affected by the refraction's Amount parameter.
In comparison, the Raw Refraction Render Element is a color render element that takes materials and their colors into account when rendering refraction. Multiplying these two render elements together produces the Refraction render element.
||Render Elements panel|| > Material rollout > Transparent Color - Refraction Filter
The Refraction Filter Render Element is useful for changing the appearance of refractive elements after rendering in a compositing or image editing application. Below are examples of possible uses.
Underlying Compositing Equation
The Refraction Filter Render Element is multiplied by the Raw Refraction to produce the same information seen in the Refraction pass, but having them separated out allows them to be manipulated individually before combining them together.
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 simply dividing the Refraction render element by the Refraction Filter render element.
Refraction ÷ Refraction Filter = Raw Refraction
Denoise – Denoises the render element.
- To properly calculate the refraction information in the Refraction Filter and Raw Refraction Render Elements, the Refraction Render Element must also be rendered at the same time, even if it is not going to be used in the compositing process. Doing so enables all the refraction information to be included in the rendering calculations.