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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.