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# docs.GL

GLSL 4
GLSL ES 3

# length

## Name

length — calculate the length of a vector

## Declaration

`float length(` | genType x`)`;

## Parameters

`x`

  Specifies a vector of which to calculate the length.

## Description

`length` returns the length of the vector. i.e., x[0] 2 + x[1] 2 + …

## Version Support

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

## See Also

distance, normalize

## 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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