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Explain how it works


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I saw this topic and tried to figure out how it works

Creating simple tornado motion using pointcloud

And I had a few questions:

1. In vopsop1 he create a parameter edge_dir and create a new attribute. How Houdini understood what he had in mind.

2. In voppop1 why he use two global variables and two point cloud open.

3. In voppop1 why he use rampparam if it's not connected to outputs.

Thanks in advance.

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