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"Jaime Vives Piqueres" <jai### [at] ignorancia org> schreef in bericht
news:4bf28f4b@news.povray.org...
> Indeed you could use this technique for that... it's very easy,
> specially
> if you are already using a heighfield for the ground. Make a copy of the
> grayscale map, and paint black the zones where you don't want grass, and
> white for the rest. Then declare a pigment function of it:
>
...and using red, green, and/or blue you can add even more distribution
possibilities; or using the greyscale intensity of course. As this, in the
end, may need much parse time, it is efficient to save the values (position,
distribution type, etc) to file and read them separately. I used that
technique for the vegetation of my TC-RTC entries:
http://www.tc-rtc.co.uk/imagenewdisplay/stills/index118.html and
http://www.tc-rtc.co.uk/imagenewdisplay/stills/index153.html
Thomas
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Am 18.05.2010 13:11, schrieb Jaime Vives Piqueres:
> For the color variation I used directly colors picked from the pic you
> linked, but they don't look so natural... perhaps because the sunlight
> color
> is somewhat yellowish.
... or perhaps because you didn't gamma-adjust the colors you picked?
Note that image manipulation programs usually give you
gamma-precorrected colors, while if you follow best practices you will
need linear colors in POV-Ray, i.e. you'll usually want to use e.g.
color rgb <pow(R/255, 2.2), pow(G/255, 2.2), pow(B/255, 2.2)>
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Thomas de Groot wrote:
> Sorry, no. I think the first image was much better. The color variation
of
> the canopy looks artificial here (only two colors? or so it appears) an
d the
> mist/cloud is a bit too stiff/heavy.
>
Plus, the light reflecting off the river looks wrong to me...
Jerome
--
mailto:jeb### [at] freefr
http://jeberger.free.fr
Jabber: jeb### [at] jabberfr
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Wow!
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