cam_pos      = [0.0826753, 0.855187, -0.351712]';
cam_dir      = [0.996592, 0.0231977, 0.0791594]';
cam_up       = [-0.0769533, -0.0841464, 0.993478]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0395108, 1.32492, 0.109159]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;