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>
> What exactly was the problem? When I tried this some time ago it worked
> without probs.
It returns error message and points at the image_map statement inside
the density.
Some time ago, this way worked for me as well...
I'm stuck!
--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
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In article <MPG.16ca4ce65d03bb809896da@news.povray.org>, lpv### [at] gmx de
says...
> What exactly was the problem? When I tried this some time ago it worked
> without probs.
Oh, I just tried re-render it, and it didn't work anymore.
So propably i created that one in MegaPov...
However, using image_pattern or a function makes it work but without
color, so you will have to use 3 medias (one for each color component).
Is there a reason why Pov 3.5 doesn't accept an image_map inside a
density?
Lutz-Peter
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Thanks for your testing, but I guess I'll have to stick to a "normal"
image (not glowing).
Also, while testing, I've found that using a contrast-adjusted and
shadow-midtone-highlight-adjusted image, I can achieve something
pretty realistic.
It was meant for a dark room, without much light, and the adjustments
to the image-map made if appear more like an in-scene radiosity-affected
image-map (though it isn't, of course).
I'll post a version of that on my homepage WIP sometime this night.
--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
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Tim Nikias <tim### [at] gmxde> wrote:
:> Already tried image_pattern?
: I only get a gray-scale image then.
It's difficult to tell what is wrong without seeing any code.
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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From: Jaime Vives Piqueres
Subject: Re: Using images in density-medias?
Date: 5 Feb 2002 16:33:04
Message: <3c604f8f@news.povray.org>
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Lutz-Peter Hooge wrote:
> Oh, I just tried re-render it, and it didn't work anymore.
> So propably i created that one in MegaPov...
Same case here... I used it on my IRTC entry for "LABORATORY", but that
was MegaPOV. I don't know right now if it was posible with 3.1, but I
doon't think so. Anyhow, I don't remember to have seen this specified as a
MegaPOV feature.... hmmmm.
Indeed, this was very handy for "luminous" objetcs with global ambient
set to 0.... I'm also curious about why this does not work on 3.5. Must
investigate...
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org
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In basic, its like this:
object{ Area hollow pigment{rgbt <0,0,0,1>}
interior{media{emission 1 intervals 1 method 3 samples 1,5
density{image_map{tga "image.tga"} translate -.5 /*centers the image*/}
}}
}
It does create some sort of emission, based on the calculated grayness
of a colored pixel, but the colors get lost. That's not the behaviour of
POV-Ray 3.1g, and probably MegaPOV (I don't use MegaPOV).
--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
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Tim Nikias <tim### [at] gmxde> wrote:
: It does create some sort of emission, based on the calculated grayness
: of a colored pixel, but the colors get lost. That's not the behaviour of
: POV-Ray 3.1g, and probably MegaPOV (I don't use MegaPOV).
When I try to render a scene like that in povray 3.1g, it says:
error: Keyword 'image_map' can only be used in a pigment statement.
In MegaPov it works, though.
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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>
> When I try to render a scene like that in povray 3.1g, it says:
>
> error: Keyword 'image_map' can only be used in a pigment statement.
>
> In MegaPov it works, though.
Thats the error I meant. Someone suggested using image_pattern,
and that gives only gray-scale media from the image.
--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
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> I wanted to create an emission-media which actually uses
> an image as base, simulating a glowing image.
color_map your emmision media!
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In article <3C602B2E.39A4AA9F@gmx.de>, Tim Nikias <tim### [at] gmxde>
wrote:
> Before, all I did, was use image-map right inside
> the density-statement, but I don't get it to work.
POV 3.5 doesn't support that feature (I wonder when it got added to
MegaPOV?), but you should still be able do it this way...
#declare imgFn = function {pigment {image_map {...}}}
density {average
density_map {
[1 function {imgFn(x, y, z).red}
color_map {[0 rgb 0] [1 red 3]}]
[1 function {imgFn(x, y, z).green}
color_map {[0 rgb 0] [1 green 3]}]
[1 function {imgFn(x, y, z).blue}
color_map {[0 rgb 0] [1 blue 3]}]
}
}
--
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/
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