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Very nice.
I guess I'm rather new at POV, because I can't figure out how the trace()
macro can be used to 'arrange them on the surface'. From the POV
documentation:
"This is the macro we call for each pixel we want to calculate. That is, the
starting point of the ray is our camera location and the direction is the
direction of the ray starting from there and going through the "pixel" we
are calculating. The macro returns the color of that pixel."
From this I gather that the trace() macro returns a color. How can a color
be used to arrange blades of grass on a surface? I would assume that you'd
need a coordinate and direction or something along those lines, not a
color... but as I said, I'm rather new at this. There's probably some
documentation that I've overlooked that explains it but I can't seem to find
it. Would you please be so kind as to explain it to me, or refer me to the
appropriate section of the documentation? Thank you.
Sun.
"moj" <moj### [at] btinternet com> wrote in message
news:3ee08f50@news.povray.org...
> Hi everyone
>
> I wasn't going to post this, but I just saw Norbert Kern's pipetree
> image so it seemed appropriate to post another example of an adaptation
> of one Gilles' excellent macros (not sure how you post a link to
> another thread but it's in povray.binaries.images).
>
> This uses the makeblade part of mgrass.inc to generate a "pallette" of
> 50 blades, then uses the trace() function to arrange them on the surface
> of a lathe-type object (actually a rotation from Moray)
>
> The colours for the grass are taken straight from the irtc winner a few
> months ago:
>
> http://www.irtc.org/ftp/pub/stills/2003-02-28/radiogrv.jpg
>
> I've been playing with povray for a couple of months now (when I should
> have been revising for finals :-) and this is my favourite object I've
> made. I'm just not sure what to do with it...
>
>
> moj34
>
>
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