cam_pos      = [0.968518, 1.80023, 1.17839]';
cam_dir      = [-0.398045, 0.10559, -0.911269]';
cam_up       = [-0.349363, 0.90105, 0.25701]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.12815, -0.559484, 0.427953]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;