Hi,

I have created some PoV-Ray model which generated 2D diagrams for me based
on parameters that I supply. The diagrams use a lot of lines and text
objects. However, the output of the diagrams is quite unclear. I would like
to see sharp lines, and sharp text objects. Now I see text which is
something so very unclear that element of the characters are not shown. For
example +-signs sometimes miss their vertical line!

I tried changes in scene configuration for anti-alias settings, and jitter
off but to no avail. Is what I want not possible? Or what am I doing wrong?
Please help. I'm doing workarounds now by generating at a very high
resolution and then downsizing the result...

I have attached a sample diagram in which the described behaviour shows.

Regards,

Lo van den Berg
lov### [at] gmailcom

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Attachments:
Download 'test.jpg' (30 KB)

Preview of image 'test.jpg'

lovandenberg wrote:
> 
> I tried changes in scene configuration for anti-alias settings, and jitter
> off but to no avail.

You need higher quality aa settings, try something like:

+a0.05 +am2 +r4

Also note lines much thinner than a pixel will inevitably appear in low 
intensity.

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

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Is the fuzz from jpeg compression or is it also present in the original 
output?

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Frankly pov-ray is far from ideal for what you are trying to do. You're  
really working with vector data, so I'd look at some sort of PDF or SVG  
oriented solution.
-- 
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

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> I have created some PoV-Ray model which generated 2D diagrams for me based
> on parameters that I supply. The diagrams use a lot of lines and text
> objects. However, the output of the diagrams is quite unclear. 

Putting aside the perversity of using PovRay for this, I use it 
reasonably often for diagrams where the programming language
allows precise effects to be created, for example the latest
diagrams for a paper are here
   http://astronomy.swin.edu.au/~pbourke/tmp/jjw/
all but "diagram" are using Pov.

I suspect you are having touble because the structure you are
trying to represent is around the same scale or smaller than a
pixel. Try thickening the geometry or rendering at higher resolution
possibly with higher antialiasing settings. If you are doing these
for publication then the higher resolution isn't such an issue since
the publishers will want that anyway.

ps: I suggest you don't use jpg for these, but then that may just
have been for posting. png or tiff would be better.

-- 
Paul Bourke
pdb_NOSPAMswin.edu.au

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"Tyler Eaves" <tyl### [at] mailshackcom> wrote:
> Frankly pov-ray is far from ideal for what you are trying to do. You're
> really working with vector data, so I'd look at some sort of PDF or SVG
> oriented solution.
> --
> Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

Hi Tyler,

I used PoV-Ray only because it has such a nice programmable coordinate
system. I don't know about other systems that have this feature.

Lo

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On Mon, 12 Sep 2005 08:37:51 -0400, lovandenberg <lov### [at] gmailcom>  
wrote:

> "Tyler Eaves" <tyl### [at] mailshackcom> wrote:
>> Frankly pov-ray is far from ideal for what you are trying to do. You're
>> really working with vector data, so I'd look at some sort of PDF or SVG
>> oriented solution.
>> --
>> Using Opera's revolutionary e-mail client: http://www.opera.com/mail/
>
> Hi Tyler,
>
> I used PoV-Ray only because it has such a nice programmable coordinate
> system. I don't know about other systems that have this feature.
>
> Lo
>

Any decent drawing library will really probably be easier to use than POV  
for anything non-trivial. You might want to look at, say, ReportLab for  
Python (PDF), or any SVG library for your language of choice. 2d != 3d,  
and you are being poorly served by using the latter to generate the former.

-- 
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

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"lovandenberg" <lov### [at] gmailcom> wrote in message 
news:web.43218afb8fc75ab5cc92659a0@news.povray.org...
> Hi,
>
> I tried changes in scene configuration for anti-alias settings, and jitter
> off but to no avail. Is what I want not possible? Or what am I doing 
> wrong?
> Please help. I'm doing workarounds now by generating at a very high
> resolution and then downsizing the result...

How about turning OFF antialiasing completely, and turning off jitter too?

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"EagleSun" <nomail@nomail> wrote:
> "lovandenberg" <lov### [at] gmailcom> wrote in message
> news:web.43218afb8fc75ab5cc92659a0@news.povray.org...
> > Hi,
> >
> > I tried changes in scene configuration for anti-alias settings, and jitter
> > off but to no avail. Is what I want not possible? Or what am I doing
> > wrong?
> > Please help. I'm doing workarounds now by generating at a very high
> > resolution and then downsizing the result...
>
> How about turning OFF antialiasing completely, and turning off jitter too?

Hi EagleSun,

turning OFF antialiasing and jitter gives even worse results, but that is to
be expected. I'm reasonably happy with the results now by using a very low
anti-aliasing threshold and more depth.

thanks for the suggestions,

Lo

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Among other things, lovandenberg saw fit to write:

> I used PoV-Ray only because it has such a nice programmable coordinate
> system. I don't know about other systems that have this feature.

Try with something like MetaPost:

http://wiki.contextgarden.net/MetaFun

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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