Well the thing is because of my light setup, the shadow cast on the ground, wich is not just the ground plane, ends up far too long and streched, I do want shadow to be cast on other figures on the scene though.

I could render the figures, hide them, then render the ground and turn them back up , but there are many figures on the scene, some of them with certain parts hidden, so doing this process over and over for every image would be very time consuming.