Hi,
I've tried what you propose : put the rotated text on a separate geode (and
not the billboard) ... The result is the same : text do not update
correctly.
I don't know what to change... I've tried to set the rotation before the
translation, whatever be the order of the instructions : is the
setRotation() is called, the text do not update with good proportions...
Any suggestion ?
Thanks,
Regards,
Vincent.
2009/1/13 Vincent Bourdier <[email protected]>
> Hi Robert,
>
> I did it from the past for a simple OSG text on a billboard node,
> without constant screen pixel size management and it works well.
>
> I'll try to get the text out from the billboard, hoping this won't
> be so difficult to obtain the same result...
>
> Thanks for this explanation.
>
> Regards,
> Vincent.
>
> 2009/1/13 Robert Osfield <[email protected]>
>
> Hi Vincent,
>>
>> I've never used osgText in conjunction with osg::Billboard before. I
>> can image the mix of on the fly compute matrices might cause problems.
>> osgText has support for billboard behaviour so I'd recommend not
>> adding the text to the billboard, instead just add it as sibling to
>> the Billboard and enable the rotate to screen option on the text
>> object.
>>
>> Robert.
>>
>> On Tue, Jan 13, 2009 at 11:59 AM, Vincent Bourdier
>> <[email protected]> wrote:
>> > Hi,
>> >
>> > Currently making my billboard node, I add an osgText on it. I need this
>> text
>> > to be in node's coordinate, but in constant pixel size on screen.
>> > When the billboard move or rotate, the text will follow it. The only
>> thing
>> > the text can change is caracter size.
>> >
>> > I use this code :
>> >
>> > osg::ref_ptr<osgText::Text> d = new osgText::Text;
>> >
>> > d->setRotation(osg::Quat(-osg::PI_2, osg::Vec3f(1,0,0)) *
>> > osg::Quat(-osg::PI_2, osg::Vec3f(0,1,0)));
>> >
>> > d->setPosition(decal*0.7);//to avoid collision between object and
>> > osgText
>> >
>> > d->setText("Test");
>> > d->setAxisAlignment(osgText::Text::USER_DEFINED_ROTATION);
>> > d->setAutoRotateToScreen(false);
>> > d->setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
>> > d->setCharacterSize(30);
>> > d->setAlignment(osgText::Text::CENTER_TOP);
>> > // d->setDrawMode(1);
>> >
>> > billboard->addDrawable(d.get());
>> >
>> > But the setRotation is making something bad.
>> >
>> > Without the setRotation line node, everything is good for text size.
>> > Rotation is bad but it is something expected.
>> > So I apply a rotation on it, to obtain the text with the good
>> orientation
>> > relative to the billboard. After that, the text rotation is good, but
>> when
>> > the camera is aproaching, the text size do not update correctly : only
>> the
>> > width stay constant in pixel size... the hight stay constant in
>> billboard
>> > coordinates size. So the text is deformed, depending on camera distance
>> from
>> > it..
>> >
>> > The question is : how to rotate the text without having this bad effect
>> ?
>> >
>> > Thanks.
>> >
>> > Regards,
>> > Vincent.
>> >
>> > _______________________________________________
>> > osg-users mailing list
>> > [email protected]
>> >
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>> >
>> >
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>
>
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