sample_circle_edge_uniform

vector2  sample_circle_edge_uniform(float u)

u

Number between 0 and 1.

Returns a unit vector2, i.e. a vector2 of length 1, based on u. Given uniform random u values in [0,1), the returned unit vectors will be uniform random and continuous with respect to u on the edge of the unit circle. Specifically, it returns (cos(angle),sin(angle)), where angle is 2*pi*u.