cam_pos      = [0.0909531, 1.30621, 0.780009]';
cam_dir      = [0.726796, 0.0533856, -0.684775]';
cam_up       = [-0.68579, 0.111856, -0.719153]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0508108, -1.31974, -0.156818]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;