Hi Jim, thanks for your comment

Allright, sorry for the confusion. What I meant concerning level blocks is that I only create them in a level which I later edit in MED (not WED!) to be able to see where the grass should "grow" so that the grass model, from the top, is shaped so it fits exactly into the level. In the demo, for example, I positioned blocks in a half-circle among the rocky walls and used them to determine in MED where to place grass and where not.

Just to clarify: In the final level, the blocks have been deleted and they have nothing to do with the script.

In deed, the script does take a grass model (which has to fit the requirements as listed above) and deforms it so it is adapted to the ground. This way, you can use few grass models (as each model has lots and lots of grass "bushes" in it) instead of hundreds of individual models - which obviously dramatically increases performance.