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pump volume h18

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This is more of a general question about how to properly inject "pump" velocity in h18.

First, What excactly is the "pump" doing? Why can't I just bring in my "v" attribute . What is the difference between velocity and "pump" ?

Also, when I create a pump from the shelf tool under the populate containers tab. Houdini creates a Flip source to create the "pump" volume. Why is this?

Are there no pyro tools to create this "pump" volume?

I will attach some screenshots and my file.

Thank you




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