Hello Michael,
On 05/09/2014 10:18 AM, Michael Raab wrote:
> I'm trying to rendering several Viewport (Scene, Overlay, ..) into 1
> FrameBufferObject. This works good in principal but read back of
> TextureBuffer/RenderBuffer is executed after each viewport.
yes, that happens and in this case is not ideal ;)
> I'm wondering if there is a better way to do this!? Do we need some
> additional functionality,e.g. a FBOWindow or another way to trigger the
> read back?
Hmm, I think basically you'd need a type of stage that can hold the
different viewports and also the roots of the trees to render into each
- IIRC the stage can create a group of RenderPartition that render into
the same FBO without going through the deactivate path (which contains
the read-back). The downside would be that since such a stage holds
pointers to roots it would act similar to the VisitSubtree core [1].
Another alternative could be to render the viewports to different FBOs
and perform a compositing step that combines their images into a final one.
Cheers,
Carsten
[1] VisitSubTree has to jump through hoops, because it provides an
escape hatch to the "nodes have at most 1 parent" paradigm without
breaking too much in the process.
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