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Rendering the following produces a big bug:
camera { location < 0, -.5, -1.7> look_at 0}
light_source { <-10,10,-10> rgb 1}
text { ttf "timrom.ttf" "BIG" .5,0 translate<-0.85, 0,0>pigment{rgb 1}}
text { ttf "timrom.ttf" "BUG" .5,0 translate<-1.05,-.67,0>pigment{rgb 2}}
background { rgb .35}
While not a serious big bug it is a big bug none the less.
--
Ken Tyler
mailto://tylereng@pacbell.net
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On Sun, 04 Jul 1999 20:00:25 -0700, Ken <tyl### [at] pacbell net> wrote:
Hi, Ken. You are correct. Using your scene code I was able to reproduce
the big bug.
>Rendering the following produces a big bug:
>
> camera { location < 0, -.5, -1.7> look_at 0}
> light_source { <-10,10,-10> rgb 1}
>
> text { ttf "timrom.ttf" "BIG" .5,0 translate<-0.85, 0,0>pigment{rgb 1}}
> text { ttf "timrom.ttf" "BUG" .5,0 translate<-1.05,-.67,0>pigment{rgb 2}}
>
> background { rgb .35}
>
>While not a serious big bug it is a big bug none the less.
The following scene source, however, will squash the big bug:
camera { location < 0, -.5, -1.7> look_at 0}
light_source { <-10,10,-10> rgb 1}
text { ttf "timrom.ttf" "BIG" .5,0 scale <1, .2, 1>
translate<-0.85,-.525,0>
pigment{rgb 1}
}
text { ttf "timrom.ttf" "BUG" .5,0 scale <1, .2, 1>
translate<-1.05,-.67,0>
pigment{rgb 2}
}
background { rgb .35}
--
Alan
--------------------------------------------------------------------
http://www.povray.org - Home of the Persistence of Vision Ray Tracer
news.povray.org - where POV-Ray enthusiasts around the world can get
together to exchange ideas, information, and experiences with others
--------------------------------------------------------------------
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Alan Kong wrote:
>
> On Sun, 04 Jul 1999 20:00:25 -0700, Ken <tyl### [at] pacbellnet> wrote:
>
> Hi, Ken. You are correct. Using your scene code I was able to reproduce
> the big bug.
> The following scene source, however, will squash the big bug:
>
> camera { location < 0, -.5, -1.7> look_at 0}
>
> light_source { <-10,10,-10> rgb 1}
>
> text { ttf "timrom.ttf" "BIG" .5,0 scale <1, .2, 1>
> translate<-0.85,-.525,0>
> pigment{rgb 1}
> }
>
> text { ttf "timrom.ttf" "BUG" .5,0 scale <1, .2, 1>
> translate<-1.05,-.67,0>
> pigment{rgb 2}
> }
>
> background { rgb .35}
>
> --
> Alan
While your solution to the Big Bug works it is a bit messy. I have a
Big Bug fix that I would like to submit for your approval. Besides fixing
this particular bug it has the potential of fixing many other Bugs as
well:
camera { location < 0, 0, -1.9> look_at 0}
light_source { <-1,1,-510> rgb 1}
text { ttf "timrom.ttf" "RAID" .5,0 scale <1,2,1>
translate<-1.2,-.35,0>
pigment { rgb 2 }
}
All kidding aside there does appear to be something wrong with the first
example I presented. If you look at the text object on top you will note
where it intersects the text object on the bottom the bottom of the top
text object appears to be thicker in the z direction than the top of the
text object on the bottom. Shouldn't they be a uniform thickness both top
and bottom for both text objects bottom and top ?
Is this a Big Bug BUG ?
--
Ken Tyler
mailto://tylereng@pacbell.net
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You sure this isn't just an optical illusion caused by the viewing
persepective? If I change the viewing point to <0, 0.5, -1.7> the problem
seems to go away. It might also be an artifact of the lighting, since when
I switch the RGB values the top letters appear to be bigger than the bottom.
--
Jim
Check out my web site http://www.kressworks.com/
It'll blow your mind (politically), stimulate your senses (artistically)
and provide scientific insights that boggle the mind!
Ken <tyl### [at] pacbellnet> wrote in message
news:378074CB.EE357A9E@pacbell.net...
>
>
> Alan Kong wrote:
> >
> > On Sun, 04 Jul 1999 20:00:25 -0700, Ken <tyl### [at] pacbellnet> wrote:
> >
> > Hi, Ken. You are correct. Using your scene code I was able to
reproduce
> > the big bug.
>
> > The following scene source, however, will squash the big bug:
> >
> > camera { location < 0, -.5, -1.7> look_at 0}
> >
> > light_source { <-10,10,-10> rgb 1}
> >
> > text { ttf "timrom.ttf" "BIG" .5,0 scale <1, .2, 1>
> > translate<-0.85,-.525,0>
> > pigment{rgb 1}
> > }
> >
> > text { ttf "timrom.ttf" "BUG" .5,0 scale <1, .2, 1>
> > translate<-1.05,-.67,0>
> > pigment{rgb 2}
> > }
> >
> > background { rgb .35}
> >
> > --
> > Alan
>
> While your solution to the Big Bug works it is a bit messy. I have a
> Big Bug fix that I would like to submit for your approval. Besides fixing
> this particular bug it has the potential of fixing many other Bugs as
> well:
>
> camera { location < 0, 0, -1.9> look_at 0}
> light_source { <-1,1,-510> rgb 1}
>
> text { ttf "timrom.ttf" "RAID" .5,0 scale <1,2,1>
> translate<-1.2,-.35,0>
> pigment { rgb 2 }
> }
>
>
> All kidding aside there does appear to be something wrong with the first
> example I presented. If you look at the text object on top you will note
> where it intersects the text object on the bottom the bottom of the top
> text object appears to be thicker in the z direction than the top of the
> text object on the bottom. Shouldn't they be a uniform thickness both top
> and bottom for both text objects bottom and top ?
>
> Is this a Big Bug BUG ?
>
> --
> Ken Tyler
>
> mailto://tylereng@pacbell.net
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Jim Kress wrote:
>
> You sure this isn't just an optical illusion caused by the viewing
> persepective? If I change the viewing point to <0, 0.5, -1.7> the problem
> seems to go away. It might also be an artifact of the lighting, since when
> I switch the RGB values the top letters appear to be bigger than the bottom.
>
> --
> Jim
Arranging it once again and incoporating one of your changes it is still
evident the the object on top is thicker than the object on the bottom -
I think.
camera { location < 0, 0, -.5> look_at 0}
light_source { <-4,4,-3> rgb 1}
text { ttf "timrom.ttf" "BIG" .5,0 translate<-0.85, 0,0>pigment{rgb 2}}
text { ttf "timrom.ttf" "BUG" .5,0 translate<-1.05,-.67,0>pigment{rgb 1}}
background { rgb .65}
--
Ken Tyler
mailto://tylereng@pacbell.net
Post a reply to this message
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Ken wrote:
> Arranging it once again and incoporating one of your changes it is still
> evident the the object on top is thicker than the object on the bottom -
> I think.
>
> camera { location < 0, 0, -.5> look_at 0}
> light_source { <-4,4,-3> rgb 1}
>
> text { ttf "timrom.ttf" "BIG" .5,0 translate<-0.85, 0,0>pigment{rgb 2}}
> text { ttf "timrom.ttf" "BUG" .5,0 translate<-1.05,-.67,0>pigment{rgb 1}}
>
> background { rgb .65}
The most compelling argument yet that there is a possible problem with
the text object comes when we render the following example. In a difference
operation with two equally thick objects we would expect a coincident surface
problem. Evidence from the following example shows this not to be the case
because there is still some of the differencing object remaing in the back
of the lower differenced text object. This indicates to me that the text
object on top is offset slightly in the -z diffection where on would instead
expect the surfaces to be flush with one another. It might be a precision
problem on the Windows platform and I would like to hear from someone
running on a different platform if they too witness what I am seeing.
camera { location < 0, .1, -.3> look_at 0}
light_source { <-4,4,-3> rgb 1}
difference {
text { ttf "timrom.ttf" "BUG" .5,0 translate<-1.05,-.67,0>pigment{rgb 1}}
text { ttf "timrom.ttf" "BIG" .5,0 translate<-0.85, 0,0>pigment{rgb 2}}
}
background { rgb .65}
--
Ken Tyler
mailto://tylereng@pacbell.net
Post a reply to this message
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On Mon, 05 Jul 1999 13:03:54 -0700, Ken <tyl### [at] pacbellnet> wrote:
>In a difference
>operation with two equally thick objects we would expect a coincident surface
>problem. Evidence from the following example shows this not to be the case
>because there is still some of the diffeneced object remaing in the back
>of the lower differenced text object. This indicates to me that the text
>object on top is offset slightly in the -z [..]
Hi, Ken. Rendered at 800w by 600h, +am2 +a0.2, the following modification
to the camera and light source location make it even more obvious:
//camera { location < 0, -.5, -1.7> look_at 0}
camera { location < 0, -0.2, -0.01> look_at 0}
//light_source { <-10,10,-10> rgb 1}
light_source { <-10,-10,-10> rgb 1}
text { ttf "timrom.ttf" "BIG" .5,0
translate<-0.85, 0,0>
pigment{rgb 1}
}
text { ttf "timrom.ttf" "BUG" .5,0
translate<-1.05,-.67,0>
pigment{rgb 2}
}
background { rgb .35}
--
Alan
--------------------------------------------------------------------
http://www.povray.org - Home of the Persistence of Vision Ray Tracer
news.povray.org - where POV-Ray enthusiasts around the world can get
together to exchange ideas, information, and experiences with others
--------------------------------------------------------------------
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On Mon, 05 Jul 1999 13:03:54 -0700, Ken <tyl### [at] pacbellnet> wrote:
>It might be a precision
>problem on the Windows platform and I would like to hear from someone
>running on a different platform if they too witness what I am seeing.
Just traced it using MS-DOS POV-Ray v3.1e, with the same results using
your scene with my modified camera and light source locations. I can still
see the edge of the text on top hanging over the bottom word.
--
Alan
--------------------------------------------------------------------
http://www.povray.org - Home of the Persistence of Vision Ray Tracer
news.povray.org - where POV-Ray enthusiasts around the world can get
together to exchange ideas, information, and experiences with others
--------------------------------------------------------------------
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Alan Kong wrote:
>
> On Mon, 05 Jul 1999 13:03:54 -0700, Ken <tyl### [at] pacbellnet> wrote:
>
> >It might be a precision
> >problem on the Windows platform and I would like to hear from someone
> >running on a different platform if they too witness what I am seeing.
>
> Just traced it using MS-DOS POV-Ray v3.1e, with the same results using
> your scene with my modified camera and light source locations. I can still
> see the edge of the text on top hanging over the bottom word.
>
> --
> Alan
When I started this thread it was simply intended to be a bit of Pov humor
and I did not for a moment think there was a bug in Pov's text object. Now
I am not so sure that this is indeed the case. Before I make a report of
this does anyone else concur there is cause for concern ?
P.S. Thanks for the input Alan.
--
Ken Tyler
mailto://tylereng@pacbell.net
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I would agree with Jim Kress and say that its an optical illusion, if
you look at the bottom of the letter "I" with the top of the letter "U",
the "I" sits on top of the "U" neatly (perfectly!).
Colin ;)
Ken wrote:
>
>
> When I started this thread it was simply intended to be a bit of Pov humor
> and I did not for a moment think there was a bug in Pov's text object. Now
> I am not so sure that this is indeed the case. Before I make a report of
> this does anyone else concur there is cause for concern ?
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