// Quadrant 1: down-right
    // Quadrant 2: down-left
    // Quadrant 3: up-left
    // Quadrant 4: up-right
    int quadrant;
    int fullray_idx;            // for cycling: where did we come from?

    int quadrant;      // 0 down-right, 1 down-left, 2 up-left, 3 up-right
    int fullray_idx;   // for cycling: where did we come from?

ray_def::ray_def() : accx(0.0), accy(0.0), slope(0.0), quadrant(0),
                     fullray_idx(0)

ray_def::ray_def()
    : accx(0.0), accy(0.0), slope(0.0), quadrant(0), fullray_idx(-1)

            ray.fullray_idx = -1; // to quiet valgrind

    int raylen = shoot_ray( accx, accy, slope, LOS_MAX_RANGE, xpos, ypos );

    int raylen = shoot_ray(accx, accy, slope, LOS_MAX_RANGE, xpos, ypos);

    ray.fullray_idx = -1; // to quiet valgrind

    {
        ray.fullray_idx = -1;   // to quiet valgrind

    }