cam_pos      = [-0.687385, 1.65899, 1.41403]';
cam_dir      = [0.962813, -0.235091, 0.133127]';
cam_up       = [0.268871, 0.881998, -0.387025]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.0351542, -0.543208, -1.2135]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;