Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:
>    Me too, tried it before but never got it right... I think it's due to the
> fact that I was always using a single while loop to place the pebbles, but
> this time used 3 loops, with increasing random sizes and decreasing number
> of pebbles. Also, the pebbles are not totally random in their placement, as
> I used a pigment function (granite) to determine if a pebble should be
> placed or not. And BTW, it is just a single mesh pebble made with
> Wings3d... :)

randomized proceduralized placement, randomized proceduralized mesh-based
geometry, randomized proceduralized imagemap-based texturing (not necessarily in
this one)... you're such a random procedural magician! :D

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On 05/06/2010 11:30 AM, clipka wrote:
> See <http://www.tc-rtc.co.uk/imagenewdisplay/stills/index207.html> for
> some other approach at sand.

   Ok, after a painful move to the new AMD Phenom II x4, that took two days
to complete, finally got the chance to try it out. I added 350,000 spheres
and it still rendered in 4h! :)


-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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Preview of image 'hormiga-suelo-02.jpg'

"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> schreef in bericht 
news:4be6d7d4@news.povray.org...
>   Ok, after a painful move to the new AMD Phenom II x4, that took two days
> to complete, finally got the chance to try it out. I added 350,000 spheres
> and it still rendered in 4h! :)
>

Yes! This is the real world! :-)

Thomas

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"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> schreef in bericht 
news:4be6d7d4@news.povray.org...
>   Ok, after a painful move to the new AMD Phenom II x4, that took two days
> to complete, finally got the chance to try it out. I added 350,000 spheres
> and it still rendered in 4h! :)

Just thinking: With the DoF, you may get away with a lesser number of 
spheres, or are they all concentrated in the sharp zone?

Thomas

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On 05/06/2010 01:59 PM, Kenneth wrote:
> Very clever!  It seems to eliminate the 'clumping together' that usually
> occurs when using a 'random' distribution. Using eval_pigment, I suppose?
> Must remember this trick!

   No, just using the pigment function on a #if statement against the stone
location:

   #if (f_distrib(stone_location.x,0,stone_location.z).gray<=.5)

   where stone_location was generated randomly over the height_field.

-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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On 05/06/2010 03:49 PM, Thomas de Groot wrote:
> Additionally, what you can use to good effect, is the prob() function.

   prob()??? ...I've never heard of that function. In fact, the only thing I
can find is prod(), which was also unknown to me, and can't see how would
use it here.

> Excellent image (as always).... I am finishing a desert scene which I
> shall show here soon. Much cruder textures however than your finely
> realistic ones

   I cheated greatly there... ;) there is only one texture for the stones,
which is a "procedularized" picture of a pebbles bed. I scaled it really
big, and translated it randomly for each pebble, making the finish also
random for each one.

-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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On 05/06/2010 05:29 PM, nemesis wrote:
> randomized proceduralized placement, randomized proceduralized mesh-based
> geometry, randomized proceduralized imagemap-based texturing (not
> necessarily in this one)... you're such a random procedural magician! :D
>

   I love rand()!!! I use it even for things as bizarre as finding the camera
placement! ;)

-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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On 05/10/2010 09:26 AM, Thomas de Groot wrote:
> Just thinking: With the DoF, you may get away with a lesser number of
> spheres, or are they all concentrated in the sharp zone?

   No, I'm not that sharp: they are scattered evenly. And there is a real
difference in realism even on the blurred zones. Oh, and 3.7 managed to
parse all the scene in 29 seconds, so why bother? :)

-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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Am 09.05.2010 17:41, schrieb Jaime Vives Piqueres:
> On 05/06/2010 11:30 AM, clipka wrote:
>> See <http://www.tc-rtc.co.uk/imagenewdisplay/stills/index207.html> for
>> some other approach at sand.
>
> Ok, after a painful move to the new AMD Phenom II x4, that took two days
> to complete, finally got the chance to try it out. I added 350,000 spheres
> and it still rendered in 4h! :)

Looking /really/ good now!

Yes, a neat QuadCore is fun with POV-Ray ;-)

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"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> schreef in bericht 
news:4be7c030@news.povray.org...
> On 05/06/2010 03:49 PM, Thomas de Groot wrote:
>> Additionally, what you can use to good effect, is the prob() function.
>
>   prob()??? ...I've never heard of that function. In fact, the only thing 
> I
> can find is prod(), which was also unknown to me, and can't see how would
> use it here.

It is not described in the docs it seems... You can find the probability 
macro as the first one in rand.inc. I use it quite often to select between 
different plants for instance, or any selection of objects.

>
>> Excellent image (as always).... I am finishing a desert scene which I
>> shall show here soon. Much cruder textures however than your finely
>> realistic ones
>
>   I cheated greatly there... ;) there is only one texture for the stones,
> which is a "procedularized" picture of a pebbles bed. I scaled it really
> big, and translated it randomly for each pebble, making the finish also
> random for each one.

Great technique! I shall remember that.

Thomas

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