sample_circle_arc

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

center

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

maxangle

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

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, in the arc within maxangle of the direction indicated by center.