Hi Detlef,

Thank you very much for the code you provided. It openned my mind with better understanding of SceneRenderer class and it's use.

However, i think that placing the HUD inside the SceneRender makes it a little hard to fill variables to be drawn, let's say for example the amount of objects already being loaded in the case of the progressbar, or the text to be drawn over the scene or even a selectionBox following the mouse when the user want's to select various objects at the same time.

So, in conjuction with your code, i studied the way the Viewer sample makes to write text on screen and ended up with a bit diferent approach. It's not so elegant as yours, unfortunatelly :)
Also, i think that the way the Viewer sample uses to build fonts and use it has a bad quality in the looks of the fonts rendered (and is too limited because don't work with Ç and accents ÓÉÍ. Outside U.S we use it a lot). I tested the ones native to the QGLWidget and found it very impressive, so i wanted to use it instead.

To accomplish all that i created a HUDRenderer class, put a pointer to it inside my VisualWidget (which extend from ScenixQGLRendererWidget) and called the draw code of the HUD in the PaintGL, like this:

void VisualWidget::paintGL() {
SceniXQGLSceneRendererWidget::paintGL();
m_hud->doRender();
//physics->update(); // will work in the near future, i hope :)
}

also, i had to make some ugly stuff like this:
void VisualWidget::renderText( int x, int y, const QString & str, const QFont & font, int listBase ) {
m_glWidget->renderText(x, y, str, font, listBase);
}
because QGLWidget is held private inside ScenixQGLWidget.
But in the end the result was pretty amazing UTF8 fonts, separated HUD code (which can be optimized for not changing projections so often like Viewer does in case of two "print" calls and is multi O.S as it uses QT renderText.
The m_hud->doRender() code looks like this:

void HUDRenderer::doRender() {
beginHudRender(); // setup ortho projection

if ( m_showFPS ) {
m_parentWidget->renderText( 2, 12, QString("FPS: %0").arg((unsigned int)floor( m_fps + 0.5 )), *m_font);
}
//draw HUD with immediate mode here (argh)
// ..progessbar, selectionbox, etc
//
endHudRender(); // go back to perspective projection
}

I'm guessing that the "correct way" of doing the HUD was to put it inside the SceneRenderer like you did, but than i would need an intermediate class to hold the hud-scene-tree to be drawed in the SceneRender. Can we vote for this feature in Scenix 8.0? ;)

Again, thank you very much for your time. It helped a lot!

best regards,
- Luís Eduardo.