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Hello,
I have a problem with media and partial transparent objects. Here is my
example:
//====================================mediatest
//global_settings { assumed_gamma 1 }
camera { location <0.0, 2, -4.0> look_at <0.0, 0.0, 0.0> }
background { rgb 0 }
light_source { <20, 100, -50> rgb 1 }
plane { y,-1 pigment { checker rgb 0, rgb 0.2 } }
box { -1,1
material
{ texture { pigment { rgbt 1 } finish { ambient 0 } }
interior
{
media {
intervals 1
scattering { 5, rgb 0.3 }
samples 1, 10
confidence 0.9
variance 1/100
ratio 0.9
}
}
}
translate <-0.5,0,0>
no_shadow
hollow
}
#local OBJ=
disc
{ <0,0,0>, z, 0.75
texture { spherical texture_map {
[0.5 pigment { rgbt 1 }]
[0.5 pigment { rgb <0,1,0>}]
[1 pigment { rgb <1,0,0>}]
} turbulence 0.3 scale 0.75
}
hollow
no_shadow
}
object { OBJ translate <-0.5,0,0> }//inside the medie
object { OBJ translate < 1.5,0,0> }//outside
//====================================mediatest EOF
and here is the renderd picture:
http://www.home.pages.at/maus84/4711/media.jpg
I tried many things but the left disc stays visible in the media. Is is
possible to make the disc in the media disapear but the texture stay? I
know, in this example I can get such an effect when I scale the disc, make
is bigger then the media-box but that is not what I want.
hope you know a solution
thank you
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oh, sorry, I use POV-Ray for Windows v3.6.1 icl8.win32
thanks
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From: Bob Hughes
Subject: Re: How to make invisible surfaces in media?
Date: 13 Mar 2006 16:34:36
Message: <4415e56c@news.povray.org>
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"Benjamin" <nanoinverno[at]web[dot]de> wrote in message
news:web.4415445a9f9b250c17488de60@news.povray.org...
>
> http://www.home.pages.at/maus84/4711/media.jpg
>
> I tried many things but the left disc stays visible in the media. Is is
> possible to make the disc in the media disapear but the texture stay?
Hiya Benjamin.
Figured it might be sampling at fault. Gave that a try, making it samples 15
(no min,max) and now shows no sign of the disc here. Also, intervals 1 isn't
needed in there since default method 3 media makes its own changes to that
(unless you really want to override it).
--
Bob H www.3digitaleyes.com
http://3digitaleyes.com/imagery/
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"Bob Hughes" <omniverse@charter%net> wrote:
> Figured it might be sampling at fault. Gave that a try, making it samples 15
> (no min,max) and now shows no sign of the disc here. Also, intervals 1 isn't
> needed in there since default method 3 media makes its own changes to that
> (unless you really want to override it).
A question (since I may have been doing some things incorrectly up until
now): Is samples 15 the same as specifying samples(15,15)? In the POV docs,
there's no mention of using just a single value for it, so I'm curious.
Also, the docs led me to believe that, with method 3, I needed to actually
specify intervals 1 rather than leave it out altogether. Is there a
difference?
BTW, awhile back I posted a little discussion about the default for
intervals being 1, not 10 as the docs say (in ver. 3.6.1) Here's the
post...
http://news.povray.org/povray.documentation.inbuilt/thread/%3Cweb.434c8b2fe42c859ad82bb7c00%40news.povray.org%3E/
This led me to think that there *might* be some other incorrectly-stated
default values for media, but I've not been able to determine that. Can
anyone out there give a definitive listing of the various media defaults?
Ken
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"Kenneth" <kdw### [at] earthlink net> wrote:
> ... Is samples 15 the same as specifying samples(15,15)?
Sorry, I meant samples 15,15 (no parentheses).
Ken
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"Kenneth" <kdw### [at] earthlinknet> wrote in message
news:web.442797743e0a76402045a15f0@news.povray.org...
>
> A question (since I may have been doing some things incorrectly up until
> now): Is samples 15 the same as specifying samples(15,15)? In the POV
> docs,
> there's no mention of using just a single value for it, so I'm curious.
That's my understanding of it, without checking the Doc. One number equates
to both min., max.
> Also, the docs led me to believe that, with method 3, I needed to actually
> specify intervals 1 rather than leave it out altogether. Is there a
> difference?
When the default became the new method 3 intervals was reworked (by Nathan
Kopp, I believe) to default to 1 so it would increase automatically instead
of being a static 10. Ever since that programming change I've just
considered it needed specifying only if one of the other methods were
chosen. I think the confusion is that, as suggested, you should not use
intervals other than 1 or else you override the automatic increase but many
times that keyword might exist in your script and you could inadvertantly
use it incorrectly.
> Can anyone out there give a definitive listing of the various media
> defaults?
Good question. If I tried to say, it would go like this:
method 1 intervals 10 samples 1,1
method 2 intervals 10 samples 1,1
method 3 intervals 1 samples 1,1
Having now looked at the Doc I see what you meant about that intervals 10 in
there, other defaults look okay. Obviously, it would not be 10 if the value
is changed internally the way that newer method type works. However, if it
did begin at ten and go lower or higher as needed that could explain it
being 10 there in the Doc. So again, a person would only be using intervals
1 (usually) if they have the keyword used at all in their media statement to
signify not to override the inner workings of the program. My memory of what
was said about it goes like: "increase as needed", so that leaves out any
decreases downward from 10.
All that said, method 3 really could begin at intervals 10 like the others
do and I hadn't thought of that. I've remembered it as being 1 internally
ever since the change was made and I could be mistaken about that. A check
of the source code would clarify this once and for all.
I took a look at the old source code and I see it shows both the 1 and 10
based on method type (if I read it correctly) and something about a
'minsamples' of 2 within the Intervals coding. It's all greek to me, though.
Curiously, I noticed AA depth 3 not 4 as stated in the Doc for method 1, so
I don't know if that's changed now or another thing that might need
clarification in the future.
--
Bob H www.3digitaleyes.com
http://3digitaleyes.com/imagery/
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