Hello Robert.
Sorry about the bad explanation of my problem.
I think is better to start from scratch and just explain the problem to you.
I'm making a widget system, on Ortho2D, that separates levels of parents
from childs by osg::Groups ( osg::PositionAttitudeTransform, osg::Switch ...
)
- The children position is always related to the bottom top vertex of the
parent ( i.e, a text inside a box ).
---------------------
| |
| |
|text (at 0,0) |
----------------------
box at (20,20)
- Children have to be drawn on top of the parent ( the parent area can be
hidden by the child but the child cannot be hidden by the parent drawing ).
( i.e white child text on a black box )
|----------------------- |
|------------------------|
|------------------------|
|---WHITE TEXT--|
|------------------------|
------------------------
My problem is to always make all kinds of Geometries that are on the leafs
of my tree as the top most visible.
For example: If i have a tree in the following sequence
root -> Rectangle1
child -> Rectangle2
child -> Triangle3
OpenGL should draw Rectangle1 than Rectangle2 and on the end Triangle3 to
the FrameBuffer.
On the monitor: Triangle2 will be above Triangle1 and Triangle3 will be
above Triangle2 (in case those are being drawn at the same place ).
---------------------------------
| -------------------- |
| | / \ | |
| | / \ | |
| | / \ | |
| | --------- | |
| | Triangle3 | |
| --------------------- |
| Rectangle2 |
| (below triangle3) |
--------------------------------
Rectangle1 ( goes below everyone )
I've made some separate tests and noticed that if my geometries have just
the same StateSet configuration ( i.e all geometries with
StateSet::setGlobalDefault ) I can make this result on the frame buffer.
But when i add a osgText::Text element for example as:
root -> Rectangle1
child -> Rectangle2
child-> osgText::Text
-----------------------------------------
| -------------------------------- |
| | "no osgText::Text" | |
| | inside | |
| |_________________ | |
| |
|_______________________|
The text will only appear if i make
_child_text->getOrCreateStateSet()->setGlobalDefaults(); that makes me to
loose transparency and other configurations for the osgText::Text component.
Screen shots from my current diagram block configuration and my scene
http://yfrog.com/6eosgproblemp
http://yfrog.com/catextdefaultp
I've already tried to use "setRenderBinDetails" ( version 2.9.5 ) and
worked... But if I simply use setRenderBinDetails i will have to rebuild
all the binNum for every visual on my graph after a simply insertChild
because they will be not in the right draw order.
For our system this is not good. Because the number of components that my
co-workers generally draw are very large and it would take very long to
rebuild the number for the graphs just because of a removal or an insertion
of component.
Is there anything that i could use to ensure that they will always be
processed in the order that they are being added as child bypassing the
state set configuration ?
Regards
Andre
2009/12/14 Robert Osfield <[email protected]>
> Hi Andre,
>
> I'm finding it difficult to guess what your after/what problems your
> seeing. The best I can do is say as a general note, one would
> typically use control the rendering order via
> StateSet::setRenderingDetails(..) from within the scene graph rather
> attempting to set globals.
>
> Robert.
>
> On Mon, Dec 14, 2009 at 2:06 PM, Andre Simoes <[email protected]>
> wrote:
> > Hello There.
> >
> > I've been reading alot of e-mails regarding drawing of objects in
> sequence,
> > like a simple OpenGL program that draws each Geometry independently of
> its
> > complexibility and cost to the GPU.
> >
> > And for now I'm working in an OSG scenario in which I'm doing a toolkit
> that
> > generates widgets in 2D Orthographic mode. Almost all of the components
> are
> > being drawn with LIGHTING disabled because they are unecessary for the
> case.
> > And with or without RenderBin::TRAVERSAL_ORDER option enabled I can add a
> > widget as a child of other widget without problems by using
> > osg::Group::insertChild( 0, child ).
> >
> > The problem is when I try to draw osgText::Texts inside components as
> > children. They simply not appear on the screen.
> > - if i create them and set their StateSet as setGlobalDefaults the text
> > appears as a Child of other widgets ( But in this case i loose color and
> > background transparency control of the text and is something i would not
> > like to loose ).
> > - If i draw them without a widget on the screen the Text appears.
> >
> > After that I thought that TRAVERSAL_ORDER could solve the problem. But
> > TRAVERSAL_ORDER is not solving the problem.
> >
> > I'm doing on the initial part of my code before creating any X Window
> with
> > osgViewer::View... :
> >
> > int main( void )
> > {
> > using namespace osgUtil;
> > RenderBin::setDefaultRenderBinSortMode(
> RenderBin::TRAVERSAL_ORDER
> > );
> > RenderBin::SortMode s = RenderBin::getDefaultRenderBinSortMode();
> >
> > /// window init
> > /// widget init
> >
> > return viewer.run();
> > }
> >
> > My questions are:
> > - Am I looking to the right option (RenderBin::TRAVERSAL_ORDER ) ?
> > - Am I setting TRAVERSAL_ORDER in the right way ?
> >
> > Sorry to ask but i already lost one week searching for documentation
> about
> > this problem and no good results.
> >
> > Kind Regards
> > Andre
> >
> >
> > _______________________________________________
> > osg-users mailing list
> > [email protected]
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
> >
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