--- title: "Refraction Filter" canonical: "https://documentation.chaos.com/space/VRAYHOUDINI/113281117/Refraction%20Filter" format: markdown --- This page gives some basic details about the Refraction Filter Render Element and how it is used in compositing. ## **Overview** --- ## **Attributes** --- ## **Common Uses** --- The Refraction Filter Render Element is useful for changing the appearance of refractive elements, after rendering, in a compositing or image editing application. In the example below, the refractions are brightened and tinted using the Refraction Filter RE. See the render before and after compositing. ## **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.** ** ** ** [Raw Refraction](https://docs-chaos.atlassian.net/wiki/spaces/VRAYHOUDINI/pages/113281118) x Refraction Filter = [Refraction](https://docs-chaos.atlassian.net/wiki/spaces/VRAYHOUDINI/pages/113279770) ![image](media://cc8dae01-547b-45cd-8b3f-735e097ac98c) ## **Notes** --- - To properly calculate the refraction information in the Refraction Filter and [Raw Refraction](https://docs-chaos.atlassian.net/wiki/spaces/VRAYHOUDINI/pages/113281118) Render Elements, the [Refraction Render Element](https://docs-chaos.atlassian.net/wiki/spaces/VRAYHOUDINI/pages/113279770) must also be rendered at the same time, even if it's not going to be used in the compositing process. Doing so enables all the refraction information to be included in the rendering calculations.