Uh.. Poser's ground plane is absolutely affectable by magnets - and if you have Poser 7, the nifty morphing tool, too.

The cloth plane is easier to morph, yes - it has more vertices, but the ground plane itself has enough to make a fair approximation of an uneven ground. That, and the fact that it's already there, in the scene makes it my first choice when I want to do something "quick and dirty" (the above picture took about 10 minutes from start to Render)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.