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Hi, in src/nodes.cpp there is a function void Node::clearPointCloud(). You could call this from void GraphManager::sendAllCloudsImpl() in src/graph_manager.cpp after sending the node. Could look like this:

    graph_[i]->publish("/openni_rgb_optical_frame", now, batch_cloud_pub_);
    graph_[i]->clearPointCloud(); //Add this line

Let me know whether that works for you.