cam_pos      = [-0.372735, 1.48022, 0.59497]';
cam_dir      = [0.879668, -0.125136, 0.45883]';
cam_up       = [0.44756, 0.544119, -0.709665]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.213936, -1.1034, -0.711085]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;