[osg-users] osg pick problem

[forest37]

 hi,all
 
    when i use the function computeIntersections to pick a drawable in the scene,it's Ok when i use osg::ShapeDrawable to build the scene。but the computeIntersections  doesn't work when i use self drawing,
I derive a class from osg::Drawable,and overwrite the function computeBound() and drawImplementation（）.
why doesn't it work?
 
    thanks for any hint
 
forest
 
 
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