hi,

"And" <49341109@ntnu.edu.tw> wrote:
> "jr" <cre### [at] gmailcom> wrote:
> > [*] without 3d goggle + data-glove interface I'd struggle anyway.  :-)
>
> If you want to learn I can teach you. ...

wow, thank you very much for the offer.  while I won't tire of seeing images of
rendered "real world organisms" posted here, I have rarely felt wanting to
create such scenes.  I'm more interested in creating abstract space(s).

wrt to the previous tree - I now think the "atmosphere" is very Haruki Murakami.
 :-)


> ... It can "populate" objects in a 2d array. ... adjust the distribution ...
> I feel this is a good function, but I cannot tried many tree type because I use
> the free version.

the result bears out the feeling.  :-)  are there no open source tools doing a
similar job?


regards, jr.

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"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "And" <49341109@ntnu.edu.tw> wrote:
> > "jr" <cre### [at] gmailcom> wrote:
> > > [*] without 3d goggle + data-glove interface I'd struggle anyway.  :-)
> >
> > If you want to learn I can teach you. ...
>
> wow, thank you very much for the offer.  while I won't tire of seeing images of
> rendered "real world organisms" posted here, I have rarely felt wanting to
> create such scenes.  I'm more interested in creating abstract space(s).
>
> wrt to the previous tree - I now think the "atmosphere" is very Haruki Murakami.
>  :-)
>

Maybe I can take a look at his novel.

>
> > ... It can "populate" objects in a 2d array. ... adjust the distribution ...
> > I feel this is a good function, but I cannot tried many tree type because I use
> > the free version.
>
> the result bears out the feeling.  :-)  are there no open source tools doing a
> similar job?
>
>
> regards, jr.

I don't know. I'm familiar with pov ray.

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On 18-1-2019 15:27, And wrote:
> //#declare trunk_13=
> #declare PR_DIFFUSE=pigment {color rgb <0.056,0.058,0.036> transmit 0/100 }
> 
> 
> #declare F1=finish{
>                     diffuse  1
>                     oren_nayar 1.117
>                     }
> 
[snip]

oren_nayar? I suppose that is a macro you wrote yourself based on this 
reflectance model? It does not seem to be mentioned in the POV-Ray docs...

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:
> On 18-1-2019 15:27, And wrote:
> > //#declare trunk_13=
> > #declare PR_DIFFUSE=pigment {color rgb <0.056,0.058,0.036> transmit 0/100 }
> >
> >
> > #declare F1=finish{
> >                     diffuse  1
> >                     oren_nayar 1.117
> >                     }
> >
> [snip]
>
> oren_nayar? I suppose that is a macro you wrote yourself based on this
> reflectance model? It does not seem to be mentioned in the POV-Ray docs...
>
> --
> Thomas

new feature of 3.7.?  The newest uberpov has this feature, too.

Post a reply to this message

On 19-1-2019 12:00, And wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> On 18-1-2019 15:27, And wrote:
>>> //#declare trunk_13=
>>> #declare PR_DIFFUSE=pigment {color rgb <0.056,0.058,0.036> transmit 0/100 }
>>>
>>>
>>> #declare F1=finish{
>>>                      diffuse  1
>>>                      oren_nayar 1.117
>>>                      }
>>>
>> [snip]
>>
>> oren_nayar? I suppose that is a macro you wrote yourself based on this
>> reflectance model? It does not seem to be mentioned in the POV-Ray docs...
>>
>> --
>> Thomas
> 
> new feature of 3.7.?  The newest uberpov has this feature, too.
> 

Not in 3.7, nor in 3.8 alpha. So, must be UberPOV.

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:

> Not in 3.7, nor in 3.8 alpha. So, must be UberPOV.
>
> --
> Thomas

No, a while back I recall clipka experimenting with using different reflection
models

Mostly since I spent some time trying to understand what went into it.
http://news.povray.org/povray.binaries.images/thread/%3Cweb.57cb6721f854a3db5e7df57c0@news.povray.org%3E/

So, it is/was actual POV-Ray:

http://news.povray.org/povray.beta-test/thread/%3C57040752@news.povray.org%3E/

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"Bald Eagle" <cre### [at] netscapenet> wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>
> > Not in 3.7, nor in 3.8 alpha. So, must be UberPOV.
> >
>
> ...it is/was actual POV-Ray:
>
> http://news.povray.org/povray.beta-test/thread/%3C57040752@news.povray.org%3E/

I just read (or re-read?) that older post; fascinating.

So I tried using the oren_nayer feature in one of the recent 3.8 alphas, but
it's not recognized. I guess it never made it into 3.8's development? Pity that;
the feature sounds quite interesting.

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"Kenneth" <kdw### [at] gmailcom> wrote:

>
> So I tried using the oren_nayer feature in one of the recent 3.8 alphas...

I meant oren_nayar

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Am 19.01.2019 um 18:13 schrieb Kenneth:

> So I tried using the oren_nayer feature in one of the recent 3.8 alphas, but
> it's not recognized. I guess it never made it into 3.8's development? Pity that;
> the feature sounds quite interesting.

The problem was that the `albedo` mode of operation is poorly defined 
for oren-nayar and the other one (I think it was minnaert, would have to 
look it up), and I haven't made up my mind yet how to solve this.

Post a reply to this message

clipka <ano### [at] anonymousorg> wrote:
> Am 19.01.2019 um 18:13 schrieb Kenneth:
>
> > So I tried using the oren_nayer feature in one of the recent 3.8 alphas, but
> > it's not recognized. I guess it never made it into 3.8's development? Pity that;
> > the feature sounds quite interesting.
>
> The problem was that the `albedo` mode of operation is poorly defined
> for oren-nayar and the other one (I think it was minnaert, would have to
> look it up), and I haven't made up my mind yet how to solve this.


?! I think the problem for oren nayar model is solved in previous:
http://news.povray.org/povray.beta-test/thread/%3C57040752@news.povray.org%3E/

with the total reflection light counted.
And the appearance of the rendered image with oren-nayar surface convinces me...

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