Thanks Robert On Wed, Nov 2, 2016 at 9:43 AM, Robert Osfield <[email protected]> wrote:
> On 1 November 2016 at 21:45, Trajce Nikolov NICK > <[email protected]> wrote: > > Hi Community, > > > > anyone knowing how to achieve this and with will to share? > > > > Thanks a bunch as always !! > > Have a look at the API's... > > First one to look at is osg::Polytope, create one of these with a unit > frustum. This will be in clip space. > > Next step transform this Polytope by the projection matrix using the > transformProvidingInverse() method (to transform a plane you multiple > it by the inverse of that matrix), so in our case the projection > matrix transform from eye space into clip space which is the inverse > of the transform we intend, but thanks to the way that planes are > transformed we can just use the projection matrix directly as long as > we use the transformProvidingInverse(). See the src/osg/CullStack.cpp > to see this in action. > > Then transform into object coordinates using the same method by > providing the view and model matrices. > > Robert. > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- trajce nikolov nick
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