@mxyzptlk
Nope, that isn't it.
Let me try to explain it better. It is basically like using the MOVE TO FLOOR by right clicking on the parameters bar except that it is a script that will move all selections to the 'ground' (selected object). While this product might work, it is for a group of instances well into the thousands. It would take FOREVER to do with this product, using the geometry editor to click each individual surface and every geometry of land i want to place said object. 😛 If you are thinking, why not just select all instances and use 'move to floor'. Well the 'floor' in this case is a wavy desert ground with differing altitudes and i want to 'plant' desert plantations to its surface.
Thanks for looking, though. I still can't find it and am starting to wonder if I made this product up in my head.