Hello Michael,
On 11/25/2011 08:57 AM, Michael Raab wrote:
> Imagine I want to render a sequence of viewports to a frame buffer object.
> The result should be the same as if I've had rendered the same sequence to
> the normal frame buffer. My understanding is that with the current
> capabilities of OpenSG1.8 that is not possible if the sequence of viewports
> contains shadowviewports. Is that correct?
yes, I can't think of a way to do that either. The FBOViewport manages
the OpenGL FBO which makes it difficult to share it.
> If yes, I was thinking about defining a class 'FBOWindow' which activates a
> FBO object and renders an arbitrary list of viewports and should produce the
> same result as if this list was rendered to std frame buffer. Do I miss
> something?
I think from a practical standpoint this can work. The only issue I see
is that a Window in OpenSG is representing an OpenGL context, so in that
sense a FBOWindow does not fit well into the picture. The FBOWindow
would probably need to contain a pointer to the "real" Window and
forward certain calls to it to make it work in places where OpenSG
accepts windows.
An alternative could be to separate the FBO and the FBOViewport by
creating a FrameBufferObject class that represents the FBO and can be
shared by multiple FBOViewports.
Cheers,
Carsten
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