Hi all,
I'm in the process of porting SpeedDreams from PLIB to OSG and I'm
currently working on the HUD. We'd like to render the HUD onto objects
within the scene, rather than place it as an overlay on-top of the scene.
I am using 'setDrawCallback()' to register a callback where the HUD
content can be updated prior to being drawn. Something like...
--
class updateHUDCallback: public osg::Drawable::DrawCallback
{
virtual void drawImplementation(osg::RenderInfo& renderInfo,const
osg::Drawable* drawable) const
{
osgText::Text* text = (osgText::Text*) drawable;
if (frame >= 999 ) frame = 100;
// Update the text with a count
if(text){
char ss[4];
sprintf(ss, "%3d", frame++);
text->setText( ss );
}
drawable->drawImplementation(renderInfo);
}
};
--
So now the problem....
We are planning/implementing Oculus Rift support which means that the
scene will actually be drawn twice (left and right eyes) and I want to
ensure that the HUD is only updated/changed once per 'frame'.
The code above would put '101' in left and '102' in right, which would
freak out the user.
Q. Is it possible to sense/detect the current camera from within the
callback?
Our code is based around osgoculusviewer (1).
Cheers,
Simon
1. https://github.com/bjornblissing/osgoculusviewer
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