What do you mean by "depth render"?

I think what you're saying is that you could create a height_field from the
isosurface, and then use that hightfield for reference in the grass-tool.
Is this correct?

The only way I would know of to do something like that is to create an
orthogonal camera view, and then use a gradient texture on the isosurface.
But without trying that, I'm not sure if it would work.  I'm assuming that
there must be an easier way.

-- 
Jeremy

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