cam_pos      = [0.239647, 1.05652, 0.546144]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.720366, 0.666957, -0.190369]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.527545, -0.826324, -0.898769]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;