cam_pos      = [0.198713, 1.04487, 0.642955]';
cam_dir      = [0.568983, 0.411289, -0.71211]';
cam_up       = [-0.82235, 0.284918, -0.492507]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.00043834, -1.15156, -0.665448]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;