On Sat, Oct 2, 2010 at 4:47 AM, Oliver Burtchen <[email protected]> wrote:
> Hello at all,
>
> I'm currently working on frustum-culling for a
> roam-algorithm-implemetation.
> Maybe someone can give me a hint what I'm missing to nail my problem down.
>
> I want to calculate the x,y-coordinates for a vertex on the screen. My
> approach (only for testing, to nail down the problem):
>
> <code>
>
> osg::Matrixd mv = osg::Matrixd::identity();
> osg::Matrixd mp = osg::Matrixd::identity();
> osg::Matrixd mw = osg::Matrixd::identity();
>
> while( !viewer.done() )
> {
> viewer.frame();
>
> if (viewer.getCameraWithFocus())
> {
> mv = viewer.getCameraWithFocus()->getViewMatrix();
> mp = viewer.getCameraWithFocus()->getProjectionMatrix();
> mw = viewer.getCameraWithFocus()->getViewport()->computeWindowMatrix();
> }
> }
>
> osg::Vec4d v = osg::Vec4d(0, 0, 0, 1.0);
> v = v * mv;
> v.normalize();
>
No! don't normalize there.
> v = v * mp * mw;
>
> This is fine, now you need to divide v by v.w().
Tim
> </code>
>
>
> Schould this give me the last-coordinates of v on the screen, when pressing
> "ESC" so the viewer terminates? I know this code only works, if the window
> has
> the focus at termination-time, this is not the problem why I'm asking.
>
> Best regards,
> Oli
>
> --
> Oliver Burtchen, Berlin
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>
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