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From: Thomas de Groot
Subject: Re: Spectral Rendering with POV-Ray
Date: 22 Sep 2012 07:19:19
Message: <505d9eb7$1@news.povray.org>
Problem with Prism.pov:

unable to find: M_Spectral_Glass

Does not appear in any of the available files.

Thomas


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From: Thomas de Groot
Subject: Re: Spectral Rendering with POV-Ray
Date: 22 Sep 2012 07:23:55
Message: <505d9fcb$1@news.povray.org>
Before all else (I noted it in my comments):

In the command line, +E should be +FE
otherwise it does not save in exr format.

Thomas


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From: Thomas de Groot
Subject: Re: Spectral Rendering with POV-Ray: comments on the tutorial
Date: 22 Sep 2012 07:47:11
Message: <505da53f$1@news.povray.org>
Ive, I have the following suggestions for your online tutorial:

1) put the *Prerequisites* block at the top of the tutorial.

2) The command line option +E should be +FE (see Docs) in the tutorial 
and in all .pov files.

3) the *Quick Overview* block is a bit confusing as it mentions all kind 
of processes which are dealt with only later. I suggest to delete this 
block, or – better – to include it at the beginning of the *Some Hints* 
block.

4) In the *First Step* block, ColorChecker.pov does not render the shown 
image, strictly speaking. This is done by SpectralComposer.pov. I 
suggest to change the first paragraph to something like: “Render the 
file ColorChecker.pov animation. This will produce a series of 
grey-scale images of the GretagMacbeth(tm) ColorChecker Chart.”. Below, 
change the corresponding text: “...will create the final PNG image shown 
above. “

5) For better understanding just tell the user to uncomment #declare 
FName = "ColorChecker"; and to comment out #declare FName = 
"Diffraction"; That would be more comprehensive / less confusing.

Thomas


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From: Ive
Subject: Re: Spectral Rendering with POV-Ray: comments on the tutorial
Date: 22 Sep 2012 08:05:49
Message: <505da99d@news.povray.org>
Am 22.09.2012 13:47, schrieb Thomas de Groot:
> Ive, I have the following suggestions for your online tutorial:
>
> 1) put the *Prerequisites* block at the top of the tutorial.
>
> 2) The command line option +E should be +FE (see Docs) in the tutorial
> and in all .pov files.
>
> 3) the *Quick Overview* block is a bit confusing as it mentions all kind
> of processes which are dealt with only later. I suggest to delete this
> block, or – better – to include it at the beginning of the *Some Hints*
> block.
>
> 4) In the *First Step* block, ColorChecker.pov does not render the shown
> image, strictly speaking. This is done by SpectralComposer.pov. I
> suggest to change the first paragraph to something like: “Render the
> file ColorChecker.pov animation. This will produce a series of
> grey-scale images of the GretagMacbeth(tm) ColorChecker Chart.”. Below,
> change the corresponding text: “...will create the final PNG image shown
> above. “
>
> 5) For better understanding just tell the user to uncomment #declare
> FName = "ColorChecker"; and to comment out #declare FName =
> "Diffraction"; That would be more comprehensive / less confusing.
>

Thomas, thank you very much!
This is very helpful and I've corrected already all the "critical 
errors" within both the web.page and the zip-file:
+FE everywhere and M_Spectral_Glass from Prism.inc has changed to 
M_Spectral_Filter.
And I will also follow your advises but it might take some time because
literally I just hear RealLife(tm) urgent calling from outside...

... more later

- Ive


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From: Thomas de Groot
Subject: Re: Spectral Rendering with POV-Ray: comments on the tutorial
Date: 22 Sep 2012 10:16:53
Message: <505dc855$1@news.povray.org>
On 22-9-2012 14:04, Ive wrote:
> Thomas, thank you very much!
> This is very helpful and I've corrected already all the "critical
> errors" within both the web.page and the zip-file:
> +FE everywhere and M_Spectral_Glass from Prism.inc has changed to
> M_Spectral_Filter.
> And I will also follow your advises but it might take some time because
> literally I just hear RealLife(tm) urgent calling from outside...
>
> ... more later
>

You are welcome; glad to have been of help. If I find something else 
I'll tell you.

I am going to play some more with your macros. There are some 
interesting possibilities and the results are very nice.

Thomas


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From: Stephen
Subject: Re: Spectral Rendering with POV-Ray
Date: 22 Sep 2012 15:00:31
Message: <505e0acf$1@news.povray.org>
On 21/09/2012 3:40 PM, Ive wrote:

> Don't say that. I've spend a lot of time making its usage intuitive.
> Maybe I failed but I would welcome feedback on that matter to improve my
> didactic skills - I know that I suck in explaining things.
>

No, no. It is just my time is so limited nowadays. But a direct appeal 
for feedback cannot be ignored.


> Aaargh! You are so right! Why the heck does 2048 look so much more
> natural to me ;)
>

Because 2048 is 2^11, I would think.

>> I also like you music and that is saying something from someone who
>> thinks anything after the 18th Century is a bit too modern.


> You've mentioned this before and I still find it surprising. Especially
> since I do listen to almost all kinds of music of different styles and
> era but I'll have to admit that the 18th and 19th century is the deepest
> gap within my musical horizon. Well, I know all the "hits" all the
> symphonies and all the stuff everybody knowns but it fails to touch me.
> On the other hand, just recently I discovered Mozart's string quintets
> and I really do love them. Maybe a question of getting older?
>
>

I might be exaggerating a bit. I don’t like 20th Century “classical” 
music with maybe the exception of Benjamin Britain.
You should maybe give Mozart’s piano for 4 hands a listen. Bach and 
Handel transport me.


>> Bloody Hell! It sounds like a slow tempo Muppets theme. Tell me that I
>> am wrong. ;-)
>>
> Haven't heard the Muppets theme since over a decade but I guess you are
> not wrong ;)
> Actually the main theme of "Just Like A William Powell" is based on the
> typical "roaring 20ies" Charleston chord progression and I think the
> Muppets-theme uses the same chords.
> But the piano bridge between the verses of "...William Powell" cites a
> famous German tune from the 20ies (or 30ies, not sure) called "Ich
> brauche keine Millionen, mir fehlt kein Pfennig zum Glück" (rough
> translation: "Don't need millions, don't miss a penny for
> happiness/luck". Finally the instrumental part is bases on "Katz' Rag"
> (named after the composer) and this was one of the very first tunes I
> played on acoustic guitar when I was learning ragtime finger-picking
> style. To put it like John Renbourn (one of my favorite British
> guitarists): "I've always tried to play like Big Bill Broonzy - and I'm
> still trying!"
>

Thank you for that. I have just spent about an hour listening to Marika 
Rökk. I loved this clip on you tube:
http://www.youtube.com/watch?v=NOc8zFCzxno


> For short, as I have actually nothing to say and do not consider myself
> an artist I do with music the same as I do with my POV-Ray images: pack
> them full with tiny references and citations in an attempt to make them
> appear more interesting,

It works for me.

> but I guess it is not working that way,

I wouldn't say that.


> ....nonetheless I'll keep trying.
>

Good! Please do.
:-D

-- 
Regards
     Stephen


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From: Stephen
Subject: Re: Spectral Rendering with POV-Ray
Date: 23 Sep 2012 16:33:21
Message: <505f7211$1@news.povray.org>
On 22/09/2012 8:00 PM, Stephen wrote:
>>
>
> No, no. It is just my time is so limited nowadays. But a direct appeal
> for feedback cannot be ignored.

Your Spectral Rendering with the updated instructions is quite simple to 
use but I need to work on lights and materials.

I posted an image of one of your favourite beasties in p.b.i. I 
decimated the mesh to speed up the rendering time. But actually it was 
the settings in the original scene that made it take so long to render. 
(It might have been the combination of light fade power, max_trace_level 
and mesh)
Anyway I need to get my head round Jamie’s Lightsys etc.



-- 
Regards
     Stephen


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From: Ive
Subject: Re: Spectral Rendering with POV-Ray
Date: 23 Sep 2012 19:12:30
Message: <505f975e@news.povray.org>
Am 22.09.2012 21:00, schrieb Stephen:
>
> Thank you for that. I have just spent about an hour listening to Marika
> Rökk. I loved this clip on you tube:
> http://www.youtube.com/watch?v=NOc8zFCzxno
>
Wow. Marika Rökk, thats a surprise ;)
Note that this video is part of a documentary and those NS "Kraft durch 
Freude" scenes are not part of the movie. Personally I do not like this 
kind of editing as especially this movie cannot be considered as NS 
propaganda flick - after all it features American jazz and tap-dance!
But on the other hand she did participate in 3rd Reich propaganda movies 
and - like Leni Riefenstahl - always claimed that she was just and 
artist and did know nothing ...

-Ive


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From: Ive
Subject: Re: Spectral Rendering with POV-Ray: comments on the tutorial
Date: 24 Sep 2012 00:34:04
Message: <505fe2bc@news.povray.org>
Am 22.09.2012 16:16, schrieb Thomas de Groot:

> I am going to play some more with your macros. There are some
> interesting possibilities and the results are very nice.
>
> Thomas
>

Have just seen your TC entry and thought I catch you here. As usual I 
enjoyed it to follow the meanwhile familiar personal from Gancaloon but 
what immediately did catch my eye: the mud seems to be more shiny than 
the gold. In case this is not on purpose (well symbolism and such) you 
might want to do something about it ;)

-Ive


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From: Thomas de Groot
Subject: Re: Spectral Rendering with POV-Ray: comments on the tutorial
Date: 24 Sep 2012 03:24:49
Message: <50600ac1$1@news.povray.org>
On 24-9-2012 6:32, Ive wrote:
> Have just seen your TC entry and thought I catch you here. As usual I
> enjoyed it to follow the meanwhile familiar personal from Gancaloon but
> what immediately did catch my eye: the mud seems to be more shiny than
> the gold. In case this is not on purpose (well symbolism and such) you
> might want to do something about it ;)
>

Caught me. You are not wrong indeed. :-)

The problem is the gold. I finally opted to switch the finish{} off as 
the result was a white, over shiny mass, and I wanted at least the gold 
/colour/ to be visible. Even so, it is not entirely to my taste but as 
so often, I get impatient with the scene and want it over with.

One solution would probably be to get some shadow over it in order to 
block the direct sun light.

For the gold texture, I used golds_37.inc, similar to golds.inc, only 
with srgb instead of rgb.

Thomas


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