Returns the arctangent of the specified value.

ret atan(x)


Item Description
[in] The specified value.

Return Value

The arctangent of the x parameter. This value is within the range of -π/2 to π/2.

Type Description

Name Template Type Component Type Size
x scalar, vector, or matrix float any
ret same as input x float same dimension(s) as input x

Minimum Shader Model

This function is supported in the following shader models.

Shader Model Supported
Shader Model 2 (DirectX HLSL) and higher shader models yes
Shader Model 1 (DirectX HLSL) vs_1_1

See also

Intrinsic Functions (DirectX HLSL)