Hi,
I have a vertex array that I would like to draw.
The data can change from frame to frame so I did
_points = new osg::DrawArrays(osg::PrimitiveSet::POINTS);
_points->setDataVariance(osg::Object::DYNAMIC);
I added that and some vertices to my geometry.
I kept a pointer to the vertices to reuse it each frame.
To draw it I was doing:
if(some_number != _vertices->size()) {
_vertices->resize(some_number, osg::Vec3());
_points->setCount(some_number);
}
for(unsigned i(0); i != some_number; ++i)
//copy data into the vertex array
Should be rather intuitive what the variables are...
Thing is, though the array changes the contents are not redrawn...
Yet if I do each frame:
_vertices = new osg::Vec3Array(some_number);
_geometry->setVertexArray(_vertices.get());
_points->setCount(some_number);
for(unsigned i(0); i != some_number; ++i)
//copy data into the vertex array
Then the contents are drawn correctly.
But I thing it does not make sense to create a new array every frame.
osg::Vec3Array even has the vector methods for resizing etc...
What am I doing wrong? Do I need to call some method to flag that the
array changed?
Thank you
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