I'd like to add another bit of info to this thread; attached are two screenshots (good.png & bad.png) rendered using almost identical code:
good.png (sharp, crisp)
--------------------------------------------------------------------
text->setFontResolution(...)
text->setCharacterSize(...)
text->setText(...)
bad.png (very blurry)
--------------------------------------------------------------------
text->setText(...)
text->setFontResolution(...)
text->setCharacterSize(...)
text->update()
Is there something wrong with my 2nd usage of osgText::Text such that I
get the poorer quality? I understand that in the first usage the font
sizes are already set before the initial text is rendered internally,
but shouldn't the 2nd usage produce identical results, given that I call
update after setting the new values? (My assumption here, however, could
be woefully wrong, but will be useful information either way. :))
On Wed, 2008-03-05 at 16:10 -0500, Jeremy Moles wrote:
> I've attached a screenshot of some text rendered in a very standard way
> using osgText:
>
> text->setFont(std::string("fonts/monospace.ttf"));
> text->setCharacterSize(size);
> text->setFontResolution(size, size);
> text->setText(label);
> text->setColor(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
>
> In the screenshot, a the very bottom, you'll see a bit of text called
> "label 6 (copy)". Take a close look at the following characters:
>
> a, e, 6, (
>
> ...and you'll notice that the glyphs are 1 (perhaps 2) pixels "chopped"
> off at the left.
>
> I've been hunting this down forever--in fact, I've made a lot of similar
> posts in the past--but I simply cannot prevent this occurrence in a
> predictable way. If I play with the font sizes I can sometimes achieve
> nearly perfect font quality, but it's all guess-work.
>
> So I've decided to go back to square one and ask the mailing lists: can
> anyone with any heavy osgText experience give me any hints as to what is
> going on? I've tried all of the KERNING options (though this is a
> monospace font), I've tried hacking Text/TextBase.cpp so that each Glyph
> absolutely is "pixel aligned", I've tried all manner of different
> fonts--but nothing seems to give predictable rendering results. My
> suspicion is that the GlyphQuads object's _texcoords values are getting
> calculated slightly wrong in some cases, but I'm not sure.
>
> Having precise font quality in osgWidget will be really important, so
> I'm willing to make any code changes necessary to facilitate this...
> _______________________________________________
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> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
<<attachment: bad.png>>
<<attachment: good.png>>
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