sample_circle_slice

vector2  sample_circle_slice(vector2 center, float maxangle, vector2 u)

center

Direction in the center of the slice. This does not need to be normalized.

maxangle

Maximum angle, in radians, away from center that any sample of the slice will be, so long as all u values are between 0 and 1.

u

Pair of numbers between 0 and 1.

Returns a vector2 of length < 1, based on u. Given uniform random u pairs of values in [0,1), the returned vectors will be uniform random and continuous with respect to u inside the unit circle, in the slice within maxangle of the direction indicated by center.