I think the tile is from the stupid hair shader node. The manual doesn't explain what it does. Without it, I was unable to get the grass to be different colors at tip and root. The hair node makes things fuzzy too - like fur. Which is good for fur, but not for the grass. That's why I was hoping somebody else had done the fur technique, but found a good way to color it. I don't like the look of this at all, but it DOES do the collision thing.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)