If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:
How £50m 'fish disco' could save farmland。im钱包官方下载对此有专业解读
Smart motion tracking，这一点在heLLoword翻译官方下载中也有详细论述
Russell Brandom，这一点在同城约会中也有详细论述