Thanks a billion.... these hints seem to have done the trick... :-)

Chris Huff wrote:

> In article <38A7F030.687658EE@psu.edu>, Paul Daniel Jones
> <pdj### [at] psuedu> wrote:
>
> > Ok, Help..... I worked till the wee hours and the liquid still does
> > not work yet (one thing at a time.... :-), anyone see something wrong
> > with the code?
>
> Well, the first thing I noticed is that you have:
>
> #declare liquid_color= rgbf <1,.6,.6,.9>
>
> And later you use
>
> pigment{color 1.9*liquid_color }
>
> in your liquid texture. This is the same as using "color rgbf < 1.9,
> 1.14, 1.14, 1.71>". This causes a problem, because although values
> larger than 1 are allowed and work as expected, they are not physically
> accurate. You can see that the shadows are more brightly lit than their
> surroundings due to the light being strengthened by the texture.
> Stick to values < 1, and you might want to use fade_color from MegaPOV
> instead of a colored texture.
>
> Another thing is you have "reflection 0.4 ambient .8 diffuse .5 phong 1
> phong_size 200" for your liquid texture. I usually keep reflection +
> ambient + diffuse <= 1 for good results(closer to physically accurate),
> and I often eliminate ambient completely(especially when radiosity is
> used). I would also use much less reflection, around 0.05-0.15:
> "reflection 0.15 ambient 0 diffuse 0.8". I don't know about the
> highlights, I usually only use specular. Which brings me to the next
> thing:
> You are using both specular and phong highlights in your glass texture.
> While this is allowed and may be done on purpose, it is probably easier
> to control when you only use one.
>
> BTW, I noticed you seem to have alternate settings for debugging,
> controlled by "#if (test=1)". Just in case you didn't know, you can also
> use "on", "yes", or "true" instead of 1, like "#if(test=yes)",
> "#if(test=on)", or "#if(test=true)". Although it is a very minor thing,
> this might make things a little easier to read.
>
> And lastly, this should probably have been posted to
> povray.text.scene-files, not povray.binaries.images.
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/

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