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# docs.GL

GLSL 4
GLSL ES 3

# reflect

## Name

reflect — calculate the reflection direction for an incident vector

## Declaration

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

`genDType reflect(` | genDType I,
| genDType 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 Shading Language Version
--- | ---
Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50
reflect (genType) | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
reflect (genDType) | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## 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. https://opencontent.org/openpub/.

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