David,
I think this just a simple matter of doing the following:
class VBO : public osg::NodeVisitor {
public:
virtual void apply(osg::Geode &geode) {
for (osg::Geode::DrawableList::const_iterator itr =
geode.getDrawableList().begin();
itr != geode.getDrawableList().end();
++itr) {
(*itr)->setUseVertexBufferObjects(true);
}
}
};
VBO vboMode;
root->traverse(vboMode);
This will convert your scene graph to use vbo's if the card supports
it.
Cheers,
Paul
David Spilling wrote:
Dear All,
Does OSG support rendering to a Vertex Buffer Object?
I'm happy with regular texture RTT, but is rendering to VBO as simple
as this:
camera->setRenderTargetImplementation(osg::CameraNode::FRAME_BUFFER_OBJECT);
camera->attach(osg::CameraNode::COLOR_BUFFER, m_texture);
where m_texture's "image" is pointing to a vertex buffer? e.g.
something like
m_vertex = (osg::Vec4f*) new osg::Vec4f[m_nx * m_ny];
m_vertexArray = new osg::Array(m_nx * m_ny, m_vertex);
m_texture->setImage(m_vertex)
?
Does this (apparently simple) operation ensure that the VBO stays
entirely on the GPU, and doesn't do a round trip via the driver/CPU?
Thanks all,
David
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