cam_pos      = [0.678585, 1.69124, 1.81028]';
cam_dir      = [0.397146, -0.119195, -0.909982]';
cam_up       = [-0.203543, 0.955397, -0.213977]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.19022, -0.359366, -0.472377]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;