POV-Ray : Newsgroups : povray.bugreports : font rendering issue, left-jutting bar in capital G of Respective font Server Time: 25 Jun 2019 20:20:13 GMT
  font rendering issue, left-jutting bar in capital G of Respective font (Message 1 to 4 of 4)  
From: jmichae3
Subject: font rendering issue, left-jutting bar in capital G of Respective font
Date: 4 Jan 2015 02:10:01
Message: <web.54a8a0064fe73fc78694a3930@news.povray.org>
font rendering issue, left-jutting bar in capital G of Respective font at
http://www.aringtypeface.com/respective/
I am trying to determine with the font author if this is a problem with the font
itself or a bug in POV 3.7. I have windows 7 x64 sp1 Ultimate Retail on an
i7-3970x with 64GiB RAM on an ASUS p9x79 deluxe motherboard and a GTX 670 video
card.
I am using 2 threads.
you can see the issue starting at about frame 0294 of the video I am making.
this is a POV issue or not?
here is an example frame with the source files.
https://www.dropbox.com/s/7k614qshcko2qti/font-rendering-issue.zip?dl=0

I had thought maybe this wasn't a font issue, since the left-jutting bar is not
extruded like the rest of the font rendering is, and strangely enough, these
razor-thin vertical gold bars are only at the front and back of the font
rendering. that's a very tight-angle font rendering curve there, wonder if
that's a problem )(floating point error or something?) for POV. and it looks
like the jut-out is right at the point of where the 2 curves split off.
interesting.


Post a reply to this message

From: jmichae3
Subject: Re: font rendering issue, left-jutting bar in capital G of Respective font
Date: 4 Jan 2015 02:45:00
Message: <web.54a8a8fc47e53cdc8694a3930@news.povray.org>
"jmichae3" <jmi### [at] yahoocom> wrote:
> font rendering issue, left-jutting bar in capital G of Respective font at
> http://www.aringtypeface.com/respective/
> I am trying to determine with the font author if this is a problem with the font
> itself or a bug in POV 3.7. I have windows 7 x64 sp1 Ultimate Retail on an
> i7-3970x with 64GiB RAM on an ASUS p9x79 deluxe motherboard and a GTX 670 video
> card.
> I am using 2 threads.
> you can see the issue starting at about frame 0294 of the video I am making.
> this is a POV issue or not?
> here is an example frame with the source files.
> https://www.dropbox.com/s/7k614qshcko2qti/font-rendering-issue.zip?dl=0
>
> I had thought maybe this wasn't a font issue, since the left-jutting bar is not
> extruded like the rest of the font rendering is, and strangely enough, these
> razor-thin vertical gold bars are only at the front and back of the font
> rendering. that's a very tight-angle font rendering curve there, wonder if
> that's a problem )(floating point error or something?) for POV. and it looks
> like the jut-out is right at the point of where the 2 curves split off.
> interesting.

the capital J in the name Jesus has this problem too, but with spikes instead
and a triangle.
Width=3180 ;4K
Height=2160
OOps, miscalculated resolution for 4K.

it seems at higher resolutions and with blown-up fonts, font rendering doesn't
do too well.
still curious of this is floating point error.
here is the single-frame that reproduces this "spike+triangle" version of the
problem.
https://www.dropbox.com/s/cmddfnmcrhfoum4/single-frame-POV-font-render-problem.zip?dl=0


Post a reply to this message

From: jmichae3
Subject: Re: font rendering issue, left-jutting bar in capital G of Respective font
Date: 4 Jan 2015 04:25:01
Message: <web.54a8c03c47e53cdc8694a3930@news.povray.org>
"jmichae3" <jmi### [at] yahoocom> wrote:
> "jmichae3" <jmi### [at] yahoocom> wrote:
> > font rendering issue, left-jutting bar in capital G of Respective font at
> > http://www.aringtypeface.com/respective/
> > I am trying to determine with the font author if this is a problem with the font
> > itself or a bug in POV 3.7. I have windows 7 x64 sp1 Ultimate Retail on an
> > i7-3970x with 64GiB RAM on an ASUS p9x79 deluxe motherboard and a GTX 670 video
> > card.
> > I am using 2 threads.
> > you can see the issue starting at about frame 0294 of the video I am making.
> > this is a POV issue or not?
> > here is an example frame with the source files.
> > https://www.dropbox.com/s/7k614qshcko2qti/font-rendering-issue.zip?dl=0
> >
> > I had thought maybe this wasn't a font issue, since the left-jutting bar is not
> > extruded like the rest of the font rendering is, and strangely enough, these
> > razor-thin vertical gold bars are only at the front and back of the font
> > rendering. that's a very tight-angle font rendering curve there, wonder if
> > that's a problem )(floating point error or something?) for POV. and it looks
> > like the jut-out is right at the point of where the 2 curves split off.
> > interesting.
>
> the capital J in the name Jesus has this problem too, but with spikes instead
> and a triangle.
> Width=3180 ;4K
> Height=2160
> OOps, miscalculated resolution for 4K.
>
> it seems at higher resolutions and with blown-up fonts, font rendering doesn't
> do too well.
> still curious of this is floating point error.
> here is the single-frame that reproduces this "spike+triangle" version of the
> problem.
>
https://www.dropbox.com/s/cmddfnmcrhfoum4/single-frame-POV-font-render-problem.zip?dl=0

perhaps GNU GMP library should be used instead of normal floating point ops to
get more precision?


Post a reply to this message

From: clipka
Subject: Re: font rendering issue, left-jutting bar in capital G of Respective font
Date: 4 Jan 2015 05:23:06
Message: <54a8ce3a@news.povray.org>
Am 04.01.2015 um 05:23 schrieb jmichae3:

> perhaps GNU GMP library should be used instead of normal floating point ops to
> get more precision?

Certainly not; while it does /look/ like a precision issue, throwing 
higher precision at it when we don't know what's really going on there 
would only guarantee that font rendering would be significantly slowed 
down. Even if it does solve the problem, I don't think we want to do 
that just because two individual glyphs in a single font that gives us 
issues.

As a matter of fact, with the Demo version of this font I do see issues 
even in Microsoft Word (albeit with other characters), indicating that 
the font is of questionable quality despite its price tag.


Post a reply to this message


Attachments:
Download 'respective.png' (16 KB)

Preview of image 'respective.png'
respective.png


 

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.