POV-Ray : Newsgroups : povray.bugreports : font rendering issue, left-jutting bar in capital G of Respective font : Re: font rendering issue, left-jutting bar in capital G of Respective font Server Time: 23 Jul 2019 11:01:50 GMT
  Re: font rendering issue, left-jutting bar in capital G of Respective font  
From: jmichae3
Date: 4 Jan 2015 04:25:01
"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?


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