Hi Stefano,
ok I added it to the cvs for the antialiasing you can do something like
this:
int vppw = vp->getPixelRight() - vp->getPixelLeft();
int vpph = vp->getPixelTop() - vp->getPixelBottom();
beginEditCP(_offsetdeco);
_offsetdeco->setFullSize(vppw, vpph);
_offsetdeco->setDecoratee(cam);
endEditCP(_offsetdeco);
glClear(GL_ACCUM_BUFFER_BIT);
unsigned int size = samples.size();
for(unsigned int i=0;i<size;++i)
{
beginEditCP(_offsetdeco);
_offsetdeco->setOffset(samples[i].x(), samples[i].y());
endEditCP(_offsetdeco);
// render scene
glAccum(GL_ACCUM, 1.0f / float(size));
glAccum(GL_RETURN, float(size) / float(i + 1));
}
glAccum(GL_RETURN, 1.0f);
Andreas
> Hi Andreas,
> thanks for the superfast reply :) Adding OffsetCameraDecorator to the cvs
> would
> be a great idea!
>
> Thanks again,
> Stefano
>
> Scrive Andreas Zieringer <[EMAIL PROTECTED]>:
>
>
>>Hi Stefano,
>>
>>yes you are right using the TileCameraDecorator for the jittering is not
>>a perfect solution. I wrote my own OffsetCameraDecorator for this
>>purpose if you like I can add it to the OpenSG cvs.
>>
>>Andreas
>>
>>
>>>Hi there!
>>>I wanted to archive a jitter antialias effect using TileCameraDecorator..
>>
>>it
>>
>>>works quite fine, except for a little unwanted behaviour I'll describe you
>>
>>in a
>>
>>>bit. This is a little excerpt of my code.. quite self-explanatory I hope.
>>>
>>>for (int i=0; i<m_bAntialiasingPasses; i++) {
>>> float dx = JITTER[i].x() / m_pFBO->getPixelWidth();
>>> float dy = JITTER[i].y() / m_pFBO->getPixelHeight();
>>>
>>> beginEditCP(m_pTileDecorator);
>>> m_pTileDecorator->setSize(dx, dy, 1+dx, 1+dy);
>>> endEditCP(m_pTileDecorator);
>>>
>>> render();
>>>}
>>>
>>>Unfortunately I'm getting a stronger effect on the edges of the window than
>>
>>in
>>
>>>the center. After looking at the OSGTileCameraDecorator I think I found the
>>>reason:
>>>
>>>TileCameraDecorator::getProjection( [...] ) {
>>>
>>> [...]
>>>
>>> Real32 left = getLeft(),
>>> right = getRight(),
>>> top = getTop(),
>>> bottom = getBottom();
>>>
>>> if(left < 0)
>>> left = -left / width;
>>>
>>> if(right < 0)
>>> right = -right / width;
>>>
>>> if(top < 0)
>>> top = -top / height;
>>>
>>> if(bottom < 0)
>>> bottom = -bottom / height;
>>>
>>> // scale the wanted part from the projection matrix
>>> Real32 xs = 1.f / (right - left),
>>> ys = 1.f / (top - bottom);
>>>
>>> [...]
>>>}
>>>
>>>So if my JITTER[i] is a negative value, what I'm getting with the
>>>TileCameraDecorator is a zoom instead of a simple translation, thus a
>>
>>different
>>
>>>aliasing compared to the one with a positive JITTER[i]. So, here are the
>>>questions :)
>>>- What's that code for? If you don't want negative values, I assume that
>>
>>you
>>
>>>wouldn't like too big values neither.
>>>- How could I achieve the wanted result?
>>>
>>>Thanks for your help!
>>>
>>>
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>>
>>
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>>VREC
>>Robert-Bosch-Straße 7
>>D-64293 Darmstadt
>>Tel. 06151-4921035
>>
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>
>
>
>
>
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D-64293 Darmstadt
Tel. 06151-4921035
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Defy all challenges. Microsoft(R) Visual Studio 2005.
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