[osg-users] Question about array binding

[Werner Modenbach]

Hi all,

I was hunting a long time for some strange effect. I discovered the reason but have some understanding issues.
Why is Code 1 not working but code 2? I would prefer Code 1 because of less data.

Code 1) (my original code is not working)
        osg::ref_ptr<osg::IntArray> osgVertexFlagsVector;

        osgVertexFlagsVector = new osg::IntArray(1);
        osgVertexFlagsVector->setBinding(osg::Array::BIND_OVERALL);
        _geometry->setVertexAttribArray(VERTEX_FLAGS_ATR_UNIT, osgVertexFlagsVector.get(), osg::Array::BIND_OVERALL);

        (*osgVertexFlagsVector)[0] = VERTEX_FLAG_VISIBLE;

Code 2) (this code is working)
        osg::ref_ptr<osg::IntArray> osgVertexFlagsVector;

        osgVertexFlagsVector = new osg::IntArray(numVertices);
        osgVertexFlagsVector->setBinding(osg::Array::BIND_PER_VERTEX);
        _geometry->setVertexAttribArray(VERTEX_FLAGS_ATR_UNIT, osgVertexFlagsVector.get(), osg::Array::BIND_PER_VERTEX);

        for (auto i=0; i<numVertices; i++)
            (*osgVertexFlagsVector)[i] = VERTEX_FLAG_VISIBLE;

Many thanks in advance

- Werner -
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