Does anyone know what the difference is, if any, between the following two
syntax? They both seem to produce the same effect when used with just media,
but I wondered whether they would have an impact on other interior items?

interior{media{MediaX} media{MediaY}}

or ....

interior{media{MediaX}}
interior{media{MediaY}}

--
Tom Melly
tom### [at] tomandluforce9couk
http://www.tomandlu.force9.co.uk

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I almost tried to give an answer then decided I had better check before doing
so.  From what I remembered of trying out these two ways of using media before I
was going to say additive and multiplicative.  After trying a few test renders I
didn't find that to be the case, or I just wasn't doing something right.
Seems that the other 'interior' contents get overwritten much the same as any
other statement block works, ie. pigment {}, normal {}, finish {}.
Now that I've read the Doc on interior, I could only find mention of two (or
more) media within one interior and it said that would be considered "additive".
Ah, wait.  I neglected to include scattering.  Now there's a big difference,
otherwise the two ways appear identical without it.

Bob

"Tom Melly" <tom### [at] tomandluf9couk> wrote in message
news:38c9aa79@news.povray.org...
| Does anyone know what the difference is, if any, between the following two
| syntax? They both seem to produce the same effect when used with just media,
| but I wondered whether they would have an impact on other interior items?
|
| interior{media{MediaX} media{MediaY}}
|
| or ....
|
| interior{media{MediaX}}
| interior{media{MediaY}}
|
| --
| Tom Melly
| tom### [at] tomandluforce9couk
| http://www.tomandlu.force9.co.uk
|
|
|

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They look the same to me (did a quick test with constant density) 

Margus

Tom Melly wrote:
> 
> Does anyone know what the difference is, if any, between the following two
> syntax?

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Me too, that's why I was asking.

--
Tom Melly
tom### [at] tomandluforce9couk
http://www.tomandlu.force9.co.uk

Margus Ramst <mar### [at] peakeduee> wrote in message
news:38CA5FFA.5217FDBF@peak.edu.ee...
> They look the same to me (did a quick test with constant density)
>
> Margus
>
> Tom Melly wrote:
> >
> > Does anyone know what the difference is, if any, between the following
two
> > syntax?

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The two examples will behave the same way in an additive mode. This is not
always the case with densities.

interior { media { density1 density2 } }

is different than

interior { media { density1 }
              media { density2 } }

The first mutiply the values and the second adds them together. (in other words
a ray is influenced by both in seperate functions).

Josh

Tom Melly wrote:

> Does anyone know what the difference is, if any, between the following two
> syntax? They both seem to produce the same effect when used with just media,
> but I wondered whether they would have an impact on other interior items?
>
> interior{media{MediaX} media{MediaY}}
>
> or ....
>
> interior{media{MediaX}}
> interior{media{MediaY}}
>
> --
> Tom Melly
> tom### [at] tomandluforce9couk
> http://www.tomandlu.force9.co.uk

--
Josh English
eng### [at] spiritonecom
"May your hopes, dreams, and plans not be destroyed by a few zeros."

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