cam_pos      = [-0.397141, 1.43938, 1.13856]';
cam_dir      = [0.885355, 0.0630543, 0.46062]';
cam_up       = [-0.0766682, 0.996997, 0.0108844]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.609872, 0.0597854, -1.18042]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;