I'm sure he won't mind. If I put source code out there for others to use, I
would expect them to modify it. All one wants is to be credited. I too
modified Gilles' macro to support trace. That's how I did my grass images
with the fireflies some time ago.

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Gail Shaw wrote:

> btw do you mind me modifying your macro? I intend to use the trace function
> to find the height of a height field and possible the eval_pigment  along
> with an imagemap to determine density of grass.

Feel free to do so. Actually, the use of eval_pigment is much better than the
current random system for many purposes. If this feature is officially supported
in POV 3.5, I'll probably update some of my macros to work with it.

G.

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