cam_pos      = [0.24492, 1.04905, 0.478143]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.641472, 0.763818, -0.071388]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.684366, -0.661565, -0.928911]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;