Hi Robert
Is _pixelSizeVector meaning the ratio of space distance to screen pixel?
Thanks for your reply.
Young
------------------ ???????? ------------------
??????: "Robert Osfield";<[email protected]>;
????????: 2017??7??31??(??????) ????4:51
??????: "OpenSceneGraph Users"<[email protected]>;
????: Re: [osg-users] Understanding osg::CulingSet::pixelSize()
andcomputePixelSizeVector()
Hi (could you sign with the name you'd like to be addressed as, it helps with
flow of threads and threads friendlier.)
I wrote the pixelSize code well over a decade ago and worked out the maths
myself, the aim was speed of operation rather than accuracy, so it's an
approximation of pixel size when transforming into screen space. The
derivation was all done on paper which I will have discarded once I had
implemented the functionality - the code remains as the formal specification of
the maths.
As it's so long since I wrote the code or even looked at (it's been working
reliably for over a decade:-) so I'd need to sit down and work exactly what
each variable does, personally I don't have time for this as I have lots of
other work to do.
Robert.
On 31 July 2017 at 09:26, ???? <[email protected]> wrote:
Hi Folks,
I am tring to understand a parameter in the function
osg::CullintSet::pixelSize, _pixelSizeVector. It is computed by the function
osg::CullingSet:: computePixelSizeVector(W, P, M). Could you please explain
what mathematical methods it is according to?
And especially, what these parameters following are meaning, P00, P20_00,
scale_00, P23, P33?
Thanks a lot.
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