Documentation

Length of a vector

Euclidean distance between two points

Returns a vector pointing in the same direction as another

faceforward toOrient incident reference  -- == oriented

Calculates the reflection direction for an incident vector

reflect incident normal -- == reflected

Calculates the refraction direction direction for an incident vector

refract incident normal eta -- == reflected

where eta is the ratio of indicies of refraction

Fractional part

Clamps x between min and max

clamp min max x -- == clamped

Linear interpolation between x and y by p, a Vec1 from 0 to 1

mix p x y = x ^* (1 - p) + y ^* p
-- mix 0 x y == x
-- mix 1 x y == y

Helper function to compare vectors

Returns rgba value given a texture and texture coordinates texture coordinates start at 0 1

Selection function

sel bool x y is akin to

bool ? x : y in C-like languages