Illustrating my question in pov-ray.advanced-users about Tim Attwood's macro 
(22 January 2007).

Thomas

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This works sorta, but you need to know the spline,
and it isn't a very good distribution on the sharp bends.

#declare rsd = seed(1);
union {
#local c = 0;
#while (c<500)
   object{Thorn
   rotate 360*rand(rsd)*z
   Spline_Trans(Stem, rand(rsd), y, 0.01, 0.01)
   }
   #local c = c + 1;
#end
}

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"Tim Attwood" <tim### [at] comcastnet> schreef in bericht 
news:45dad2e5@news.povray.org...
> This works sorta, but you need to know the spline,
> and it isn't a very good distribution on the sharp bends.
>
> #declare rsd = seed(1);
> union {
> #local c = 0;
> #while (c<500)
>   object{Thorn
>   rotate 360*rand(rsd)*z
>   Spline_Trans(Stem, rand(rsd), y, 0.01, 0.01)
>   }
>   #local c = c + 1;
> #end
> }
>


Yes, this is another possibility for a more cactus-like object. I shall try 
that too!

Thanks a lot, Tim.

Thomas

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This is a result test when using 
Point_At_Trans(vnormalize(<Norm.x,0,Norm.z>)). Exactly what I wanted. The 
top is trashy, but that can easily be corrected :-)

Thanks again, Tim.

Thomas

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"Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> This is a result test when using
> Point_At_Trans(vnormalize(<Norm.x,0,Norm.z>)). Exactly what I wanted. The
> top is trashy, but that can easily be corrected :-)
>
> Thanks again, Tim.
>
> Thomas

It looks OK to me, nice topiary

Stephen

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"Stephen" <mcavoys_AT_aolDOT.com> schreef in bericht 
news:web.45db25b96a72babbf1cb1e660@news.povray.org...
>
> It looks OK to me, nice topiary
>

Yes, this works quite well. When I saw Tim's code, I immediately thought 
about its use for topiaries and all those cases where vegetation is hanging 
down a wall. But its use could certainly be extended to lots of other 
applications! For instance, a figure covered with bees? or flies?  :-)

Thomas

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"Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> "Stephen" <mcavoys_AT_aolDOT.com> schreef in bericht
> news:web.45db25b96a72babbf1cb1e660@news.povray.org...
> >
> > It looks OK to me, nice topiary
> >
>
> Yes, this works quite well. When I saw Tim's code, I immediately thought
> about its use for topiaries and all those cases where vegetation is hanging
> down a wall. But its use could certainly be extended to lots of other
> applications! For instance, a figure covered with bees? or flies?  :-)
>
> Thomas

Or made of bees or point glows as a hive intelligence (?).
I looked at your image again at home on a decent screen and I see what you
mean about the top being messy.


Stephen

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"Stephen" <mcavoys_AT_aolDOT.com> schreef in bericht 
news:web.45dc0ab06a72babbf1cb1e660@news.povray.org...
>
> Or made of bees or point glows as a hive intelligence (?).
Yes, indeed, that would also be an interesting idea to work out.

> I looked at your image again at home on a decent screen and I see what you
> mean about the top being messy.
Yes, it mainly comes from the leaf image that contains a long stem. So, 
first thing to do is get rid of that. Secondly, this is where the supporting 
object bends away. It may then be viewpoint-related. I shall have to 
investigate.

Fwiw, there are some 6000 leaves here and it took v.3.7 about 5 minutes to 
parse and render on a Pentium D machine. About 30 minutes with v.3.6.

Thomas

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"Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> "Stephen" <mcavoys_AT_aolDOT.com> schreef in bericht
> news:web.45dc0ab06a72babbf1cb1e660@news.povray.org...
> >
> > Or made of bees or point glows as a hive intelligence (?).
> Yes, indeed, that would also be an interesting idea to work out.

Especially in an animation. :-)

> > I looked at your image again at home on a decent screen and I see what you
> > mean about the top being messy.
> Yes, it mainly comes from the leaf image that contains a long stem. So,
> first thing to do is get rid of that. Secondly, this is where the supporting
> object bends away. It may then be viewpoint-related. I shall have to
> investigate.

Yes POV can make or break an image.

> Fwiw, there are some 6000 leaves here and it took v.3.7 about 5 minutes to
> parse and render on a Pentium D machine. About 30 minutes with v.3.6.
>



Stephen

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"Stephen" <mcavoys_AT_aolDOT.com> schreef in bericht 
news:web.45dc6fb26a72babbf1cb1e660@news.povray.org...
>
>> Fwiw, there are some 6000 leaves here and it took v.3.7 about 5 minutes 
>> to
>> parse and render on a Pentium D machine. About 30 minutes with v.3.6.
>>
>
> Impressive, it is probable time I upgraded my wife's machine :-)
>

Well, that might be a good idea :-)

However, there are limits still. The same image, with 2000 leaves but with 
four different image_maps choosen randomly (see image), took about 15 
minutes and the hard drive started to protest. You can easily get to the 
limits of your memory that way.

Thomas

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