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Wasn't it Slime who wrote:
>> At the moment I can only generate rectangular panels of these greebles.
>> I tried generating a rectangular panel and then using an intersection on
>> it to create a triangular patch, but the render time went through the
>> roof, presumably because it loses the bounding boxes on the little
>> pieces, so it has to test each ray against thousands of greeble units.
>> This image rendered in 1m 53s, but a similar model made from triangular
>> patches would take several days.
>
>Try intersecting each individual greeble with the sides of the triangle,
>instead of making one huge intersection.
Unfortunately, with this system, I don't keep a record of where the
individual greeble units are going to end up being placed. They're
created deep inside a recursive routine and can form part of a union
that is translated many levels higher in the recursion hierarchy.
Several copies of the same greeble are translated to different
locations, allowing the construction of repetitive patterns, so I can't
pass down the information about the translations from the higher levels
to the lower levels.
I think the way to go might be to look for a way to subdivide an
arbitrary triangle into a set of rectangular panels and then fill in the
bits round the edge with triangular greebles. Don't want to use
triangular subdivision everywhere, because that would end up with the
overall pattern having an odd triangular look to it. Don't want to just
slice the arbitrary triangle into lots of tiny squares, because I want
to end up with a range of greeble sizes.
--
Mike Williams
Gentleman of Leisure
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Wasn't it Thomas de Groot who wrote:
>
>"Mike Williams" <nos### [at] econym demoncouk> schreef in bericht
>news:4463efd6@news.povray.org...
>> Inspired by the SOTW discussion of greebles.
>
>This looks very interesting indeed!
>
>SOTW.... ? Did I miss something? I cannot find any discussion on greebles in
>the POV-Ray ng's...
It was mentioned in passing in this thread:
http://news.povray.org/povray.binaries.images/thread/%3C445ef575%40news.povray.org%3E/
--
Mike Williams
Gentleman of Leisure
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> SOTW.... ? Did I miss something? I cannot find any discussion on greebles
> in
> the POV-Ray ng's...
Oh, there are a few times this subject has risen. Someone form this
newsgroup ("DLG" or so) gave me even some oh-soo-useful links in one of my
own threads, which I like herewith to share with you:
http://en.wikipedia.org/wiki/Greeble
http://www.econym.demon.co.uk/isotut/pigment.htm
http://www.scifi-meshes.com/tutorials/norling/greeble/greeble.html
More examples of Greebles and POV-Ray in my threads "SF: Preview 11+:
Imperial Carrier" within this newsgroup.
Best greetings,
Sven
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Thanks a lot Mike and Sven!!
There are so many messages to read, that I tend to become rather selective
in view of the time it takes to read them all, so I missed those. The
downside is of course that I might miss interesting stuff...
Thomas
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"Mike Williams" <nos### [at] econymdemoncouk> wrote:
> Inspired by the SOTW discussion of greebles.
Hey Mike, this looks really cool! Only one critique, however: how about
making all the textures dull, and not shiny? Seems to me that if something
was out in space long enough, even if started out shiny, eventually dust
particles (space dust)would make the surface dull.... or am I wrong? Maybe
I've just seen too many space flicks where the spaceships have a flat white
finish, and it always looked convincing.
Maybe some cylindrical sections would be doable?
I agree with Slime's plan for intersecting only a few objects for triangular
sections and leaving the objects which don't need to be intersected out of
the boolean operation. He's also right about intersection of groups taking
longer to compute than intersections of many individual objects.
Anyways, this looks good, and I look forward to seeing more!
~Sam
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"Mike Williams" <nos### [at] econymdemoncouk> wrote:
> Inspired by the SOTW discussion of greebles.
I know nothing about greebles, but to me it looks like a couple of
stretched-out Borg ships mating :)
--
Dan
GoofyGraffix.com
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"Thomas de Groot" <t.d### [at] internlnet> wrote in message
news:44643096$1@news.povray.org...
> SOTW.... ? Did I miss something? I cannot find any discussion on greebles
> in
> the POV-Ray ng's...
Greebles previously saw the LOD on this NG in 2004 coutesy of
Tom York
http://news.povray.org/web.41610916796e6d8c2ff34a90%40news.povray.org
and Roman Reiner last year
http://news.povray.org/web.43451e51558e2808acb032b40%40news.povray.org
The earliest POV reference I see is from Pete in August 2001
http://news.povray.org/5300.642T2750T13246151PeterC%40nym.alias.net
and
http://news.povray.org/16581.641T2197T13635666PeterC%40nym.alias.net
So there is a history.
I used google...
http://www.google.com/search?hl=en&lr=&safe=off&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=site%3Anews.povray.org+greeble&btnG=Search
DLM
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> Several copies of the same greeble are translated to different
> locations, allowing the construction of repetitive patterns, so I can't
> pass down the information about the translations from the higher levels
> to the lower levels.
Well, each time you copy a CSG object POV-Ray makes a separate version of it
anyway, so you could pass the translation info down and do something like
intersection {
object {greeble[i] translate greebleoffset}
plane{clippingplane1}
plane{clippingplane2}
plane{clippingplane3}
}
- Slime
[ http://www.slimeland.com/ ]
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"dlm" <me### [at] addressinvalid> schreef in bericht
news:446562ef$1@news.povray.org...
>
> Greebles previously saw the LOD on this NG in 2004 coutesy of
> Tom York
> http://news.povray.org/web.41610916796e6d8c2ff34a90%40news.povray.org
> and Roman Reiner last year
> http://news.povray.org/web.43451e51558e2808acb032b40%40news.povray.org
> The earliest POV reference I see is from Pete in August 2001
> http://news.povray.org/5300.642T2750T13246151PeterC%40nym.alias.net
> and
> http://news.povray.org/16581.641T2197T13635666PeterC%40nym.alias.net
> So there is a history.
>
>
> I used google...
>
http://www.google.com/search?hl=en&lr=&safe=off&client=firefox-a&rls=org.moz
illa%3Aen-US%3Aofficial&q=site%3Anews.povray.org+greeble&btnG=Search
>
Indeed there is!!! Thanks a lot!
I just made a quick search in the ng's by Outlook Express, which gave no
results. Should have gone to Google of course :-)
Thomas
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Thanks, DLM,
for sharing these useful links again! I would be interested to see some of
your renders, because I think, someone who knows about Greebles must have
made SF (SciFi) images and other things related to Greebles.
Greetings,
Sven
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