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Lets say I have a picture. Via patterns, averaging
pigments, layered textures etc I'd like to blur the
image_map. How would I do that? I've first though
about translating the image_map off to the right,
and then rotate that translation, i.e. translating the
image to the right, then down, then left, then up.
The more samples I take, the more I average together.
This obviously doesn't truly blur the image and is
very visible as a circular effect... Any ideas?
--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmx de
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In article <3eef33fb$1@news.povray.org>,
"Tim Nikias v2.0" <tim### [at] gmxde> wrote:
> Lets say I have a picture. Via patterns, averaging
> pigments, layered textures etc I'd like to blur the
> image_map. How would I do that? I've first though
> about translating the image_map off to the right,
> and then rotate that translation, i.e. translating the
> image to the right, then down, then left, then up.
> The more samples I take, the more I average together.
> This obviously doesn't truly blur the image and is
> very visible as a circular effect... Any ideas?
It sounds like you are translating the individual pigments to points on
the perimeter of a circle. Try translating them to random points inside
the circle instead.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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Tim Nikias v2.0 wrote:
>Lets say I have a picture. Via patterns, averaging
>pigments, layered textures etc I'd like to blur the
>image_map. How would I do that? I've first though
>about translating the image_map off to the right,
>and then rotate that translation, i.e. translating the
>image to the right, then down, then left, then up.
>The more samples I take, the more I average together.
>This obviously doesn't truly blur the image and is
>very visible as a circular effect... Any ideas?
>
>
>
Not sure what circular effect you are seeing, you might
try something like the following, it seemed to look like
bluring to me.
#local Blur_Image = pigment {
image_map {
png "testimg.png"
}
};
#local Blur_Left = pigment { Blur_Image translate <0.01,0,0>};
#local Blur_Right = pigment { Blur_Image translate <0,0.01,0>};
#local Blur_Up = pigment { Blur_Image translate <-0.01,0,0>};
#local Blur_Down = pigment { Blur_Image translate <0,-0.01,0>};
box {
<0,0,0>, <1,1,0.001>
texture {
pigment {
average
pigment_map {
[1, Blur_Image]
[1, Blur_Left]
[1, Blur_Right]
[1, Blur_Up]
[1, Blur_Down]
}
}
finish { ambient 0.3 }
}
translate <-0.5,-0.5,0> // center on the origin
}
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Random positions -inside- a circle should look good.
But it will render a *lot* quicker if you can find some way to blur the texture
before you apply it.
--
Tek
http://www.evilsuperbrain.com
"Tim Nikias v2.0" <tim### [at] gmxde> wrote in message
news:3eef33fb$1@news.povray.org...
> Lets say I have a picture. Via patterns, averaging
> pigments, layered textures etc I'd like to blur the
> image_map. How would I do that? I've first though
> about translating the image_map off to the right,
> and then rotate that translation, i.e. translating the
> image to the right, then down, then left, then up.
> The more samples I take, the more I average together.
> This obviously doesn't truly blur the image and is
> very visible as a circular effect... Any ideas?
>
> --
> Tim Nikias v2.0
> Homepage: http://www.digitaltwilight.de/no_lights
> Email: Tim### [at] gmxde
>
>
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Doh! I just read your reply to my other post on p.b.i. Now I understand why you
want to avoid processing the image beforehand :)
--
Tek
http://www.evilsuperbrain.com
"Tek" <tek### [at] evilsuperbraincom> wrote in message
news:3eef7d52$1@news.povray.org...
> Random positions -inside- a circle should look good.
> But it will render a *lot* quicker if you can find some way to blur the
texture
> before you apply it.
>
> --
> Tek
> http://www.evilsuperbrain.com
>
>
> "Tim Nikias v2.0" <tim### [at] gmxde> wrote in message
> news:3eef33fb$1@news.povray.org...
> > Lets say I have a picture. Via patterns, averaging
> > pigments, layered textures etc I'd like to blur the
> > image_map. How would I do that? I've first though
> > about translating the image_map off to the right,
> > and then rotate that translation, i.e. translating the
> > image to the right, then down, then left, then up.
> > The more samples I take, the more I average together.
> > This obviously doesn't truly blur the image and is
> > very visible as a circular effect... Any ideas?
> >
> > --
> > Tim Nikias v2.0
> > Homepage: http://www.digitaltwilight.de/no_lights
> > Email: Tim### [at] gmxde
> >
> >
>
>
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:-)
I've found a way. I find it pretty neat, cause I
just LOVE when I can do all kinds of stuff with
POV alone...
What I do:
Render image with only specular highlights, rest
black.
Load that via image_map. Fiddle with patterns so
that I have the image_map only from <0,0,0> to
<1,1,0>, with an outer border in pure black.
This pigment is then translated around a circle
with quasi-even distribution (achieved using a
neat fibonacci-distribution method which requires
no heavy processing, but just a single float value
to generate position).
Voila! The image is blurred!
Now, since this blurs the main specular highlights away,
I just add another layer with the unblurred specular
highlights.
Done! I'll post a nice example shortly.
--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde
> Doh! I just read your reply to my other post on p.b.i. Now I understand
why you
> want to avoid processing the image beforehand :)
>
> --
> Tek
> http://www.evilsuperbrain.com
>
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In article <3eef7d52$1@news.povray.org>, "Tek" <tek### [at] evilsuperbraincom>
wrote:
> But it will render a *lot* quicker if you can find some way to blur the
> texture before you apply it.
Use an image_map of a function image of a pigment function with the
blurred pigment.
image_map {
function xRes, yRes {
pigment {average...}
}
}
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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From: Lutz-Peter Hooge
Subject: Re: Creating blurred image via textures...?
Date: 17 Jun 2003 17:57:14
Message: <3eef8eba$1@news.povray.org>
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Tim Nikias v2.0 <tim### [at] gmxde> wrote:
> Lets say I have a picture. Via patterns, averaging
> pigments, layered textures etc I'd like to blur the
> image_map.
It should be possible with functions, but will that will
be slow and limited to grayscale.
You can also mildly blur an image_map with my bicubic
interpolation patch, but thats's limited to 16 samples, so
no huge blur radius.
Lutz-Peter
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From: Tim Nikias v2 0
Subject: Re: Creating blurred image via textures...?
Date: 17 Jun 2003 18:04:03
Message: <3eef9053@news.povray.org>
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Did it with pigment-patterns alone, but had to
go through a function once to apply my own
color-map for transparencies. Thanks for
the suggestion anyways!
--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde
>
> > But it will render a *lot* quicker if you can find some way to blur the
> > texture before you apply it.
>
> Use an image_map of a function image of a pigment function with the
> blurred pigment.
>
> image_map {
> function xRes, yRes {
> pigment {average...}
> }
> }
>
> --
> Christopher James Huff <cja### [at] earthlinknet>
> http://home.earthlink.net/~cjameshuff/
> POV-Ray TAG: chr### [at] tagpovrayorg
> http://tag.povray.org/
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I've done it averaging quasi-even distributed samples
in a pigment and pass that through a function to
apply my own color-map for transparency-handling.
Want to experiment a little with how many samples
may be used for that...
--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde
> > Lets say I have a picture. Via patterns, averaging
> > pigments, layered textures etc I'd like to blur the
> > image_map.
>
> It should be possible with functions, but will that will
> be slow and limited to grayscale.
>
> You can also mildly blur an image_map with my bicubic
> interpolation patch, but thats's limited to 16 samples, so
> no huge blur radius.
>
> Lutz-Peter
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