@Name: Sphere
@Version: 1.0
@Description: Set Fill=0 for a hollow sphere.
@Tags: shape
@Radius: 1.0
@Fill: 0
float r = mix(@Radius, @Radius*pow(random(next),1.0/3.0), @Fill);
float z = 2.0 * random(next) - 1.0;
float th = 2.0 * PI * random(next) - PI;
float za = sqrt(1.0-z*z);
return r * vec3(za*cos(th), za*sin(th), z);