Hello Carsten,
I followed your proposal and implemented the following to methods, which are
called as expected...
Action::ResultE onEnterGeometry( CNodePtr& pNode, Action * action )
{
RenderAction *ra = dynamic_cast<RenderAction *>(action);
MaterialDrawable *pMD = dynamic_cast<MaterialDrawable
*>(pNode.getCPtr());
Material::DrawFunctor func;
func = osgTypedMethodFunctor1ObjPtr(pMD,
&MaterialDrawable::drawPrimitives);
// retrieve id material
osg::ChunkMaterialPtr m =
SelectionHelper::getInstance()->getIDMaterial(osg::getContainerId(pNode));
ra->dropFunctor(func, m.getCPtr());
if(ra->pushVisibility())
{
if(ra->selectVisibles() == 0)
{
ra->popVisibility();
return Action::Skip;
}
}
return Action::Continue;
}
Action::ResultE onLeaveGeometry( CNodePtr&, Action * action )
{
RenderAction *ra = dynamic_cast<RenderAction *>(action);
ra->popVisibility();
return Action::Continue;
}
The problem is, my id material seems to be ignored (the result is a standard
rendering). This seems to be caused by RenderAction::dropFunctor as this
method, first looks at an internal material and afterwards checks the material
that I pass to that function.
if(getMaterial() != NULL)
{
pMat = getMaterial();
}
else if(mat != NULL)
{
pMat = mat;
}
else
{
return;
}
Any ideas how this can be avoided without changing OpenSG1.8 source?
Thanks,
Michael
-------- Original-Nachricht --------
> Datum: Mon, 15 Nov 2010 09:23:22 -0600
> Von: Carsten Neumann <carsten_neum...@gmx.net>
> An: opensg-users@lists.sourceforge.net
> Betreff: Re: [Opensg-users] ID Buffer Selection
> Hello Michael,
>
> On 11/15/2010 08:35 AM, Michael Raab wrote:
> > I'm interested in doing scene selection using id buffer information as
> we have very large scenes. I had a look at the appropriate OpenSG1.8
> tutorial. Adding a switch material to each materialgroup isn't solution for
> us.
>
> why?
>
> > Do you have an idea about alternative implementation strategies, e.g.
> assigning some attachments and derive render action?
>
> you can change the callback called by the RenderAction for Geometry on a
> per RenderAction instance basis. So you could create two RenderAction
> objects and for one you use registerEnter()/registerLeave() to change
> the Geometry callback to something that does the id-buffer rendering
> instead of using the normal material.
> More specifically: Geometry registers
> MaterialDrawable::renderActionEnterHandler as its default handler,
> create a function
>
> OSG::Action::ResultE
> idBufferRenderEnter(OSG::CNodePtr &node, OSG::Action *action)
> {
> // basically the same as MaterialDrawable::renderActionHandler,
> // but don't use the MaterialDrawable's material,
> // instead get the id buffer material from some attachment, or so
> }
>
> and register it with a RenderAction instance, similar for the leave
> handler.
>
> Cheers,
> Carsten
>
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