Function random_direction

plugins/siege-engine.cpp:243–248

static Random::MersenneRNG rng;

static void random_direction(float &x, float &y, float &z)
{
    float vec[3];
    rng.unitvector(vec, 3);
    x = vec[0]; y = vec[1]; z = vec[2];
}

static double random_error()
{