gistfile1.elm

module Vector where 
 
type Vec3 = (Float, Float, Float)
 
add : Vec3 -> Vec3 -> Vec3
add (x,y,z) (u,v,w) = (x+u,y+v,z+w)
 
mul : Float -> Vec3 -> Vec3
mul a (x,y,z) = (a*x,a*y,a*z)
 
sub : Vec3 -> Vec3 -> Vec3
sub a b = add a (mul -1 b)
 
dot : Vec3 -> Vec3 -> Float
dot (x,y,z) (u,v,w) = x*u + y*v + z*w
 
abs : Vec3 -> Float
abs v = sqrt (dot v v)
 
unit : Vec3 -> Vec3
unit v = mul (1/(abs v)) v