[osg-users] Working with osg::Text on animation

[Ravi Mathur]

There are plenty of osg examples that show how to create your own event
handler by subclassing from GUIEventHandler. For example look at osgpoints.

Make your own event handler, and change the text visibility (using its node
mask) based on whatever keys you choose.

To update text dynamically, use an update callback attached to the Text
node. See the osgcallback example.

---
Ravi

Sent from my phone, please excuse my brevity.

On Thu, Dec 20, 2018, 9:14 PM Sam Brkopac <brkopac at gmail.com wrote:

> Use event handlers, node masks or a switch.
>
> Sent from my iPhone
>
> > On Dec 20, 2018, at 5:28 PM, Diego Mancilla <dmancillac at gmail.com>
> wrote:
> >
> > Hello ravi,
> >
> > Thank you for your your answer.
> >
> > What you suggest can be accomplish by the use a visitor or a callback?:
> Lets say that I want to change show/hide the text when the user press a
> key, moreover, if some of the text for  nodes (cessna) should be
> shown/hidden with some key  and others (glider) with another. And at the
> same time, each text varies in time (like if they were their
> positions)...How can I accomplish this?
> >
> > Cheers,
> >
> >
> >
> > ravidavi wrote:
> >> If you will be dynamically changing your text, then specify that when
> you first create it:    osgText::Text* text = new osgText::Text;
> >>     text->setDataVariance(osg::Object::DYNAMIC);
> >> Note that setting the data variance isimportant for multithreaded
> Viewers (http://forum.openscenegraph.org/viewtopic.php?t=10441&view=next).
> >>
> >>
> >> Then you can change the text easily:
> >>     text->setText("insert dynamically-generated string here");
> >>
> >>
> >> You can show/hide the text with its node mask:
> >>     text->setNodeMask(0x0); // NodeMask = 0 to hide
> >>     text->setNodeMask(~0x0); // NodeMask = 0xffffffff to show
> >>
> >>
> >> Hope that helps,
> >> Ravi
> >>
> >>
> >>
> >> On Thu, Dec 20, 2018 at 8:39 AM Diego Mancilla < ()> wrote:
> >>
> >>
> >>> Hello,
> >>>
> >>>  I have a couple of doubts regarding the proper way of handling
> osg::Text inside an animation.
> >>>
> >>>  For the sake of simplicity lets say we are working on the osganimate
> example, and we have multiple cessna moving around.
> >>>
> >>> 1- What is the proper way of changing the text of osg::Text on
> runtime? For instance, if I want to display current position of cessna.
> >>>
> >>> 2- How can I hide/show the current value of the text on user request
> (stoke of key for example).
> >>>
> >>> Thank you!
> >>>
> >>> Cheers,
> >>>
> >>> ------------------
> >>> Read this topic online here:
> >>> http://forum.openscenegraph.org/viewtopic.php?p=75329#75329 (
> http://forum.openscenegraph.org/viewtopic.php?p=75329#75329)
> >>>
> >>>
> >>>
> >>>
> >>>
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> >
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=75333#75333
> >
> >
> >
> >
> >
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