Jim Charter <jrc### [at] msncom> wrote:

> Thing is, with this model it is too much work
> to edit the mesh so a material with ior can be used.  At least too much
> at the moment.

Probably I am making wrong assumptions, but if you are keeping this mesh in
a separate file and #including it in your main scene file, and it is too
big to comfortably edit, can't that be as simple as using something like
this in the main scene?

object {
  #include "Chalice.mesh" // or whatever;

  interior {
    ior 10
  }
}

No editing of the mesh file required, just an appropriate fresnel reflection
statement for the mesh. Possibly the exponent keyword will be more useful to
you, though.

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Tom York wrote:
> Jim Charter <jrc### [at] msncom> wrote:
> 
> 
>>Thing is, with this model it is too much work
>>to edit the mesh so a material with ior can be used.  At least too much
>>at the moment.
> 
> 
> Probably I am making wrong assumptions, but if you are keeping this mesh in
> a separate file and #including it in your main scene file, and it is too
> big to comfortably edit, can't that be as simple as using something like
> this in the main scene?
> 
> object {
>   #include "Chalice.mesh" // or whatever;
> 
>   interior {
>     ior 10
>   }
> }
> 
> No editing of the mesh file required, just an appropriate fresnel reflection
> statement for the mesh. Possibly the exponent keyword will be more useful to
> you, though.
> 
> 
Yes I believe you are right.  Anyway to be sure I thought it time for a 
quick test.

Eggs from left to right
1. Mesh2 with original texture applied in the texture list
2. Mesh2 with exponent .125 added to original texture and applied in 
texture list
3. Mesh2 with interior { ior 1.18 } applied in object wrapper as you suggest
4. Mesh2 with texture list removed and material{texture{...} interior 
{ior 1.18}} applied in object wrapper
5. Scaled sphere primitive with original texture
6. Scaled sphere with exponent added to texture
7. Scaled sphere with material applied

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Attachments:
Download 'img.0134.jpg' (101 KB)

Preview of image 'img.0134.jpg'

Jim Charter nous apporta ses lumieres en ce 02/04/2006 14:17:
> Tweeks:
>     
> on the metal
>     reflection raised significantly esp the lower or coincident
>     value ( .1 .6  ->  .6 .9 )
>     specular roughness tweeked up by ~ 50x ( now .12 )
>     color changed to try and match the brass in the reference
>     (rather than gold) ( rgb CHSL2RGB( <70,.12,.29> ) )
> 
> on the enamel
>     desaturated the colors by 50% and tinted the white marks
>     lowered specular 3x ( -> .2 ) but increased specular roughness      
> 400x     ( -> .4)
>     increased reflection slightly ( .1 .3 -> .2 .4 )
> 
> changed the photo behind the camera and increased its ambient
> 
> desaturated the lights so they still vary, but across a smaller color 
> range and are all much closer to white
> 
> included a shot of the reference
> 
> 
> ------------------------------------------------------------------------
> 
> 
> ------------------------------------------------------------------------
> 
Very impressive! Looks like the original may have looked like when almost new. Save
your file and 
try aging it some. Darkening the enamels and adding some grime over the metal parts.

-- 
Alain
-------------------------------------------------
You can go anywhere you want if you look serious and carry a clipboard.

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I hadn't thought a texture on a mesh would look different from same used 
sphere but your test seems to show the 2 and 6 are maybe a little different. 
Interesting how those two have such enhanced highlights from neighboring 
eggs and a bit of a brightnened area on the checkers below the light(?).

You said fresnel before so I wanted to clarify I wasn't suggesting it; only 
that the old keyword reflection_exponent was exchanged with the shortened 
keyword exponent and isn't related to fresnel, directly anyhow AFAIK. At 
least, it (the old keyword) existed before fresnel did, IIRC. Keyword 
falloff in the reflection block might be something similar yet still not the 
same thing.

Didn't want people reading here to get confused about this, hopefully not 
anyhow.

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Jim Charter <jrc### [at] msncom> wrote:
> Stephen wrote:
> > Jim Charter <jrc### [at] msncom> wrote:
> >
> >>Stephen wrote:
> >>


> My father's mother was born in Scotland and he and his two brothers and
> six sisters made a big deal of it.  And of course they kept their
> hardwood polished. Polished.
>



> > Oh! Nice brushes BTW
>
> I can't tell you enough.  They were thin you see, so they didn't suck up
> a lot of expensive paint.  And those long, irregular, limp bristles.
> Perfect.  Especially for oil paint of the certain viscosity that I
> liked.  I used a lot of varnish and stand oil in my medium.  Funny they
> are sold as gesso brushes.  The hog's hair swells with water which makes
> them useless.
>

When you are working with your hands. The importance of good tools cannot be
over emphasised.

> >

> > humble way:-)
> >
>
> No opinion due to my ignorance of that tale.  Maybe I can get back to
> you on it tho'.



thought. JC the New York cabbie who plays classics to his clients.




Not so fanciful as my wife has said it to me after a 400 mile journey.

Stephen

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Bob H wrote:

> 
> You said fresnel before so I wanted to clarify I wasn't suggesting it; only 
> that the old keyword reflection_exponent was exchanged with the shortened 
> keyword exponent and isn't related to fresnel, directly anyhow AFAIK. At 
> least, it (the old keyword) existed before fresnel did, IIRC. Keyword 
> falloff in the reflection block might be something similar yet still not the 
> same thing.
> 
> Didn't want people reading here to get confused about this, hopefully not 
> anyhow.
> 
Well I am the one who created the confusion.  I was blathering as usual.

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"Jim Charter" <jrc### [at] msncom> schreef in bericht
news:443130d0$1@news.povray.org...
> Thomas de Groot wrote:
> > My goodness! This is the very thing now!
> > Very much a Grail object (just been reading Robert Holdstock lately
:-) )
> >
> Thanks Thomas, I'll give Holdstock a look, I am not currently familiar.
>   Actually someone in my household took "Stonehenge" (Bernard Cornwell)
> out of the library and I read a bit yesterday, while letting others use
> the computer.  Historical fiction, but fun, and I guess it suits my mood
> somehow given I am picturing religious artifacts lately, lol.  Actually
> the whole humble-cup/ornate-relinquary concept is kinda weird when you
> think about it.
>

Ah! Cornwell, yes indeed. Did you read "the Winter King"? Arthurian legend
in an archeologically sound environment.
Holdstock is another matter. My mental associations often make big jumps!
Holdstock explores the myth-generation process of the mind and builds some
extremely fascinating stories around that concept, usually drawing
inspiration from the Mabinogion and the Arthur legend embedded there.

Thomas

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Jim Charter <jrc### [at] msncom> wrote:
> Well I have put most of my energies in life into things
> that don't make money.  And presto, I don't
> have much money! It's a serious joke, my friend.

thankfully, the purpose of life has nothing to do with making money.  Money
is great for buying you food, nothing more...

> It may seem counter-intuitive to others but
> realists or mimeticists can be genuinely surprised at the outcome of a
> painting or image.

I believe this is true for most artists:  to begin from scratch, with a few
sketches and look how far you can get by just throwing mud... :)

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Jim Charter wrote:

Impressive. Do you ever spend the money to print these object studies?

  -Shay

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none wrote:
> Jim Charter wrote:
> 
> Impressive. 

Thanks Shay


Do you ever spend the money to print these object studies?
> 


Nah.  Actaully I did a lot of printing of all sorts of things when I was
demoing printers in stores and printed out my works as well as that of 
some others here.  The results were interesting but really never 
rivalled a photograph for intrinsic interest.  The one I like best was a 
print of the Boli figure.

But there are better machines to print with than the little consumer 
printers I was demoing obviously.

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