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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