vector sample_direction_cone(vector center, float maxangle, vector2 u)
center
Direction in the center of the cone. This does not need to be normalized.
maxangle
Maximum angle, in radians, away from center that any sample of the cone will be, so long as all u values are between 0 and 1.
u
Pair of numbers between 0 and 1.
Returns a unit vector, i.e. a vector of length 1, based on u. Given uniform random u pairs of values in [0,1), the returned unit vectors will be uniform random and continuous with respect to u on the surface of the unit sphere, in the area within maxangle of the direction indicated by center.
See also
