While playing Risen 2: Dark Waters on the initial island I noticed that on far away mountains, the foliage was flickering. It is never seen on the nearby plants but is seen many times on distant plants. Many times I have also seen that while running in an area will lot of heighted trees, the trees directly in front of the character keeps changing their angle of display. It seems like they try to adjust themselves to be seen properly to userís eye. I am using NVidia 460GTX 1GB with latest drivers installed in my system. I have kept the graphic settings of this game on high. What can be the cause of this problem?