Hi,
The bug has been found in ImageOverlay::init() method.
The original code is:
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0] = osg::Vec4(1,1,1,_alpha);
geometry->setColorArray( colors );
geometry->setColorBinding( osg::Geometry::BIND_OVERALL );
when change it to:
osg::Vec4Array* colors = new osg::Vec4Array(4);
(*colors)[0] = osg::Vec4(1,1,1,_alpha);
(*colors)[1] = osg::Vec4(1,1,1,_alpha);
(*colors)[2] = osg::Vec4(1,1,1,_alpha);
(*colors)[3] = osg::Vec4(1,1,1,_alpha);
geometry->setColorArray( colors );
geometry->setColorBinding( osg::Geometry::BIND_PER_VERTEX );
the alpha value are applied correctly.
I don't know if it a bug in osg core library.
...
Thank you!
Cheers,
Ou
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=47225#47225
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