at a low render setting the grass looks bad, but also there are a couple of things to change on the root node IMHO. I wrote a script to edit the grass planes root nodes.

import poser
scene = poser.Scene()
inps = [ 8,9,20,21]
for actor in scene.Actors():
    if "grass" in actor.Name().lower():
        for material in actor.Materials():
            tree = material.ShaderTree()
            for node in tree.Nodes():
                if node.Type() == "poser":
                    inputs = node.Inputs()
                    for i in inps:
                        inputs[i].SetFloat( 0.0 )
            tree.UpdatePreview()

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