Okay, so something like this should work, I guess.
void updateTexture( IplImage *img, ref_ptr<Node> geode)
{
ref_ptr<StateSet> state = geode->getOrCreateStateSet();
ref_ptr<Texture2D> Tex = (Texture2D*)
state->getTextureAttribute(0,StateAttribute::TEXTURE);
Tex->setImage(img);
return;
}
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