I am wondering of there is a way to use a height field to position objects.
For example, I would like to place glows slighty above an undulating hf.
Here is a
visual representation:

     O
___|____   O                                          O
___________
              |__|___      O         __________|________|
                          |___|_____|


The circles are where the glows would appear.  I would like to do something
like use the hf height to modify the glow height.  Maybe <somex,
hf+0.25,somez>

Is this possible?

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