cam_pos      = [-0.220624, 1.45192, 0.897724]';
cam_dir      = [0.71016, 0.0487587, 0.70235]';
cam_up       = [-0.0627255, 0.998014, -0.00586136]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.932649, 0.0530573, -0.946705]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;