Hello Sebastian,
[email protected] wrote:
> I want to render a scene two times filling the depth-buffer during the
> first render-pass and using the depth-buffer then to render the second
> pass (with another geometry).
> I added an OSG::DepthChunk to both geometries (the same Chunk for both)
> and I also added an OSG::RenderBuffer (as depth buffer with internal
> format GL_DEPTH_COMPONENT24) to my OSG::FrameBufferObject.
>
> I disable my second geometry using OSG::Node->setTravMask(0), then I
> render the first time with OSG::Window->render(ra).
> At this point I want the depth-buffer to be filled.
> I enable the second geometry now and disable the first geometry. Then I
> render again with OSG::Window->render(ra).
>
> What I get is the image resulting from rendering the second geometry (as
> expected) but without respect to the filled depth-buffer. Depth buffer
> seems to work because when I set it to GL_GREATER nothing is rendered at
> all.
>
> So my question is: How can I keep the depth-buffer when I render the next
> image?
the depth buffer is cleared by the Background that you use when
rendering to the FrameBufferObject. You can disable the depth clear by
calling:
bg->setDepthClear(false);
Cheers,
Carsten
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