sample_circle_ring_uniform

Since	17.0

vector2  sample_circle_ring_uniform(vector2 u, float alpha)

u

Pair of numbers between 0 and 1.

alpha

The inner radius to be bounded by. A number between 0 and 1.

Returns a vector2 of length < 1, based on u. Given uniform random u pairs of values in [0,1), and value alpha in [0,1], the returned vectors will be uniform random and continuous with respect to u inside the unit circle ring with inner radius of alpha. Specifically, it returns scale*(cos(angle),sin(angle)), where angle is 2*pi*u.x and scale is sqrt((1-alpha^2)*u.y+alpha^2).