El Miércoles 21 Mayo 2008ES 10:29:10 Vincent Bourdier escribió:
> No one have any idea on how to do it ?
> I just need to get alpha value on a material on a picked node.
>
> Thanks,
>
> Regards,
>     Vincent.
>
> 2008/5/20 Vincent Bourdier <[EMAIL PROTECTED]>:
> > Hi all,
> >
> > trying to get alpha value on a material, on a node, I use
> > mat->getAmbient(osg::Material::FRONT).a()
> >
> > but mat depends on a picked node, and If I pick somewhere different,
> > sometimes it crashes...
> >
> > I suppose I is a osg::material::face problem.
> >
> > Is there any way to get alpha value (setAlpha() exist but not getAlpha())
> > without needs to do that ?
> > thanks.
> >
> > Regards,
> >    Vincent.

You have to guess why your program is crashing by looking at the stack trace. 
I think what it is happening is that you are trying to get a StateSet from a 
node that hasn't got one, so you are receiving a null pointer.
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