cam_pos      = [0.319245, 1.1084, 0.369489]';
cam_dir      = [0.568083, 0.430265, -0.701537]';
cam_up       = [-0.360918, 0.896348, 0.257485]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.983679, -0.142209, -0.883772]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;