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!
>
>
> ----------------------------------------------------------------
> This message was sent using IMP, the Internet Messaging Program.
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Opensg-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/opensg-users
>
--
VREC
Robert-Bosch-Straße 7
D-64293 Darmstadt
Tel. 06151-4921035
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
Opensg-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/opensg-users
