Re: [osg-users] osgText setColor problem

[Robert Osfield]

On 11 November 2016 at 06:58, Rambabu Repaka  wrote:
> Hi,Iam new to osg can anyone help me in setting a color to the 2d text.

Just look at the code. The osgtext example for instance.  It was
written *exactly* for this purpose.
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Re: [osg-users] osgText setColor problem

[Rambabu Repaka]

Hi,Iam new to osg can anyone help me in setting a color to the 2d text.

... 

Thank you!

Cheers,
Rambabu

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[osg-users] osgText setColor problem

[Matthew Parry]

Hi,

I've got a simple function which creates a text object and attaches it to a 
Geode:

osg::ref_ptrosg::Geode
drawLabels()
{
osg::ref_ptrosg::Geode geode = new osg::Geode;

osg::ref_ptrosgText::Font font = 
osgText::readFontFile(fonts/forte.ttf);
osg::ref_ptrosgText::Text text1 = new osgText::Text;
text1-setFont(font.get());
text1-setColor(osg::Vec4(1.0f,0.0f,0.0,1.0f));
text1-setCharacterSize(200.0f);
text1-setPosition(osg::Vec3(0.0f,0.0f,0.0f));
text1-setAxisAlignment(osgText::Text::SCREEN);
text1-setText(SomeText);


geode-addDrawable(text1.get());

return geode.release();
}

Everything works correctly (correct font, size, etc...) except that whatever I 
put in the setColor function call, the text is always black. I tried setting 
GL_LIGHTING to off for the geode but it had no effect.
Any Ideas?

Cheers,
Matthew

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Re: [osg-users] osgText setColor problem

[Robert Osfield]

Hi Mathew,

I now idea what might amiss.  What happens when you run the osgtext example?

Robert.

On Thu, Mar 10, 2011 at 2:46 PM, Matthew Parry matthew...@live.co.uk wrote:
 Hi,

 I've got a simple function which creates a text object and attaches it to a 
 Geode:

 osg::ref_ptrosg::Geode
 drawLabels()
 {
        osg::ref_ptrosg::Geode geode = new osg::Geode;

        osg::ref_ptrosgText::Font font = 
 osgText::readFontFile(fonts/forte.ttf);
        osg::ref_ptrosgText::Text text1 = new osgText::Text;
        text1-setFont(font.get());
        text1-setColor(osg::Vec4(1.0f,0.0f,0.0,1.0f));
        text1-setCharacterSize(200.0f);
        text1-setPosition(osg::Vec3(0.0f,0.0f,0.0f));
        text1-setAxisAlignment(osgText::Text::SCREEN);
        text1-setText(SomeText);


        geode-addDrawable(text1.get());

        return geode.release();
 }

 Everything works correctly (correct font, size, etc...) except that whatever 
 I put in the setColor function call, the text is always black. I tried 
 setting GL_LIGHTING to off for the geode but it had no effect.
 Any Ideas?

 Cheers,
 Matthew

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Re: [osg-users] osgText setColor problem

[Matthew Parry]

Hi Robert,

I just tried running the example and the color works correctly. I'm now even 
more confused!

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Re: [osg-users] osgText setColor problem

[Robert Osfield]

Hi Matthew,

On Thu, Mar 10, 2011 at 3:23 PM, Matthew Parry matthew...@live.co.uk wrote:
 I just tried running the example and the color works correctly. I'm now even 
 more confused!

Might you have a StateSet higher up in the scene graph that decorates
the Text drawable and override it's state, such as adding
multi-texturing or provideding an osg::Material that switches off the
GL_COLOR_MATERIAL feature that allows glColor to override the colour.

Robert.
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Re: [osg-users] osgText setColor problem

[Matthew Parry]

Ok, I tried attaching it to the root node and the color now works, previously 
it was attached to a ShadowedScene node which was itself attached to the root. 
So obviously something in that ShadowedScene node is causing the problem, I 
still don't know what it is as I don't do set anything in the stateset that 
should affect the text color to my knowledge but at least it works now! Thanks 
for the help.

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Re: [osg-users] osgText setColor problem

[Robert Osfield]

Hi Matthew,

On Thu, Mar 10, 2011 at 3:56 PM, Matthew Parry matthew...@live.co.uk wrote:
 Ok, I tried attaching it to the root node and the color now works, previously 
 it was attached to a ShadowedScene node which was itself attached to the 
 root. So obviously something in that ShadowedScene node is causing the 
 problem, I still don't know what it is as I don't do set anything in the 
 stateset that should affect the text color to my knowledge but at least it 
 works now! Thanks for the help.

The shaders used for shadowing will probably be the culprit, or
perhaps you text is just in shadow ;-)

Do you want your text to be effected by shadows?  If not putting them
outseide of teh ShadowedScene subgraph would be the thing to do.

Robert.
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