Hi Simon,
can you try to add
sphereVol.transform(ra->top_matrix());
before
sphereVol.transform(matToScreen);
Andreas
> hi list
>
> i'm trying to project the radius of a bounding sphere onto the
> screen to get the area of the sphere in viewport coordinates.
>
> something is wrong with the code below. somehow, i'm missing the
> conversion from world into to screen coordinates... i did not find
> any hints in the documentation so far.
>
> Action::ResultE AreaLOD::draw(Action *action)
> {
> RenderAction* ra = dynamic_cast<RenderAction*>(action);
>
> ...
>
> DynamicVolume vol = ra->getActNode()->getVolume(false);
> vol.morphToType(DynamicVolume::SPHERE_VOLUME);
> SphereVolume sphereVol = (SphereVolume&)vol.getInstance();
> Real32 radiusWorld = sphereVol.getRadius();
>
> Matrix matToScreen
> ra->getCamera()->getWorldToScreen(matToScreen,
> *ra->getViewport());
> sphereVol.transform(matToScreen);
>
> Real32 radiusScreen = sphereVol.getRadius();
>
> ...
> }
>
> any ideas?
>
> thanks a lot,
> simob
>
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Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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