reflect - OpenGL ES 3.1 Reference Pages

## Name

reflect — calculate the reflection direction for an incident vector

## Declaration

`genType reflect(` | genType I,
| genType N`)`;

## Parameters

`I`

  Specifies the incident vector.

`N`

  Specifies the normal vector.

## Description

For a given incident vector `I` and surface normal `N` `reflect` returns the reflection direction calculated as ``I` - 2.0 * dot(`N`, `I`) * `N``.

`N` should be normalized in order to achieve the desired result.

## Version Support

| OpenGL ES Shading Language Version
--- | ---
Function Name | 1.00 | 3.00 | 3.10
reflect (genType) | ✔ | ✔ | ✔

## See Also

dot, refract

## Copyright

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.