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a pic to my question in povray.newusers
Post a reply to this message
Attachments:
Download 'disklines.jpg' (83 KB)
Preview of image 'disklines.jpg'
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"marabou" <not### [at] available yet> wrote in message
news:3bd6c430@news.povray.org...
>
> a pic to my question in povray.newusers
>
I haven't read you newusers post, but it looks like a case of AA
erasure. The line is so small the effect of anti-Aliasing completely erases
it. At a different angle, it will probably show up again.
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Bill DeWitt wrote:
>
> I haven't read you newusers post, but it looks like a case of AA
> erasure. The line is so small the effect of anti-Aliasing completely
> erases it. At a different angle, it will probably show up again.
would you explain what this mean:
The line is so small the effect of anti-Aliasing completely
erases it.
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Glad to see you back, old fart.
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Repeat your image at 800 x 600.
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"marabou" <not### [at] availableyet> wrote in message
news:3bd6e48c@news.povray.org...
> Bill DeWitt wrote:
>
> >
> > I haven't read you newusers post, but it looks like a case of AA
> > erasure. The line is so small the effect of anti-Aliasing completely
> > erases it. At a different angle, it will probably show up again.
>
> would you explain what this mean:
> The line is so small the effect of anti-Aliasing completely
> erases it.
If a line or a point is smaller than a pixel or so, the averaging of the
color values of the pixels surrounding it makes it fade into insignificance,
ie: Erasure.
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From: Christoph Hormann
Subject: Re: border lines are missing [82.7kb]
Date: 24 Oct 2001 12:26:21
Message: <3BD6EBAB.3816042C@gmx.de>
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Bill DeWitt wrote:
>
> If a line or a point is smaller than a pixel or so, the averaging of the
> color values of the pixels surrounding it makes it fade into insignificance,
> ie: Erasure.
But this is not solved by not using AA. In fact (as someone mentioned in
.newusers), AA usually helps to make it better visible.
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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later i used the option +a0.0 after trevor quayle inspired me to do.
now i see the lines but they look ugly.
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"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3BD6EBAB.3816042C@gmx.de...
>
>
> Bill DeWitt wrote:
> >
> > If a line or a point is smaller than a pixel or so, the averaging of
the
> > color values of the pixels surrounding it makes it fade into
insignificance,
> > ie: Erasure.
>
> But this is not solved by not using AA. In fact (as someone mentioned in
> .newusers), AA usually helps to make it better visible.
I am not sure what you are saying, but sometimes lines disappear because
of AA. Here is an example (image below). The only way to fix this particular
example is to make the "edge" a little larger.
////////////////////////////////////////////
////////////// Camera //////////////////////
camera { //
right < -1.333, 0.0, 0.0 > //
up < 0.0, 1.0, 0.0 > //
direction < 0.0, 0.0, 1.0 > //
location < 2.0, 3.0, 5.0 >/2 //
look_at < 0.0, 1.0, 0.0 > //
} //
////////////// end Camera //////////////////
/////////////// Light ////////////////
light_source { < -100.0, 100.0, 100.0 >
color rgb < 1.0, 1.0, 1.0 > }
///////////////////////////////////////
/////////////// Light ////////////////
light_source { < -100.0, 100.0, -100.0 >
color rgb < 1.0, 1.0, 1.0 > }
///////////////////////////////////////
#declare edge = 0.0015;
box {
<-1, -1, -1> // one corner position <X1 Y1 Z1>
< 1, 1, 1> // other corner position <X2 Y2 Z2>
pigment { rgb 0.75 }
translate < 0.5, 0.0, 0.0 >
}
box {
<-1, -1, -1> // one corner position <X1 Y1 Z1>
< 1, 1, 1> // other corner position <X2 Y2 Z2>
pigment { rgb 0.75 }
Post a reply to this message
Attachments:
Download 'AA Line Test.jpg' (16 KB)
Preview of image 'AA Line Test.jpg'
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Yes, when you have very thin lines like that, even AA does not always
achieve what you would hope for as the program and the final output is
ultimately limited by the resolution of the image. Tthe best bet then is, as
someone else mentioned, is increase the resolution of your image.
-tgq
"marabou" <not### [at] availableyet> wrote in message
news:3bd6f95e@news.povray.org...
>
> later i used the option +a0.0 after trevor quayle inspired me to do.
> now i see the lines but they look ugly.
>
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