[osg-users] osgviewerMFC pick problem

[OpenSceneGraph Users]

在 2020年6月29日星期一 UTC+8下午7:56:26，OpenSceneGraph Users写道：
>
> Does this happen with all models?
>
> The underlying intersection code will be the same whether you using osgick 
> code integrated with osgviewerMFC or using the osgpick.  I don't know why 
> you mention vsgviewer as it doesn't having picing code it, so do you add it?
>
> The thing that will change with the different viewer might be the mouse 
> coordinates or the projection matrices used.  The other possibility is that 
> it's just fluke and it just happens that with your modified osgviewerMFC 
> it's showing problems.
>
> If it's not a viewer specific issue then numerical precision issues can 
> cause intersection misses.  The 
> osgUtil::IntersectionVisitor/LineSegmentIntersector that underpins picking 
> has had various improvements over the years to help minimize this.  You can 
> also select double precision maths.
>
> You don't mention anything about your data, or the OSG version you are 
> using so we can only provide general statements.   You'll need to provide 
> more information about your data, OSG version, the exact code modifications 
> you've made for us to be provide any further help.
>
> Robert.
>

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