fractional

cited

GLSL-Function

Fractional part

float fract(float x)  
vec2 fract(vec2 x)  
vec3 fract(vec3 x)  
vec4 fract(vec4 x)

The fract function returns the fractional part of x, i.e. x minus floor(x). The input parameter can be a floating scalar or a float vector. In case of a float vector the operation is done component-wise.