vector2 sample_circle_arc(vector2 center, float maxangle, float u)
Direction in the center of the arc. This does not need to be normalized.
Maximum angle, in radians, away from
center that any sample of the arc
will be, so long as
u is between 0 and 1.
Number between 0 and 1.
Returns a unit vector2, i.e. a vector2 of length 1, based on
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