3507431c30
The coarse positions given to the evaluator are skipped if there are
vertices not attached to faces. Use the cache from 8e967cfeaf
to skip that topology query, or even to tell if there are no such vertices,
so we can skip a copy completely. I observed a 12x improvement for this
step, from 7.5 ms to 0.6 ms on a 1 million vertex grid.
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