Thanx for the explanation and the test files. I see what you mean. Will look into your file this evening.
I think it's great, but, when placed onto vertex, vegetation may look 'uniform'. That is why random option is important.
But there is another problem: in order to make the grass look somewhat 'realistic' you will have to really crank up mesh
resolution (in our case its the huge landscape plane) which may drop FPS significantly (I haven't seen your example yet - maybe it's not that bad
)...