Wispy smoke tutorial

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I'm taking a few days to look at houdini for the first time.

I'm making my way through the totorials-in particular ‘wispy smoke’.
In Part 3 after Step 6.
I do not see the result I expect which is a few metaballs being driven
by particles (created at step 1). All the other steps seem to work fine till this point.

“Copy metaball to points

In the Viewer pane press tab > Copy and RMB-click twice to accept. Wire the output of the delete1 sop into the Template input of the Copy sop. Playback the results.”

They mean connect the ‘delete1’ output into the left side input port of the ‘Copy’ node correct? I do this but the metaballs don't move.
Ive repeated Part 3 several times now and i don't think i have whats expected (upon playback).

Is there anything obvious i am missing?
Maybe its some obscure display I've missed (thats easy to do)?

-thanks
ral
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I don't have the tutorial, but the left input of the copy SOP is for the primitives to copy while the right input is for the templates. You can MMB on an input gadget to see what it is for.
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Indeed thanks Ondrej.
I was looking for a way to indentify the ports-I guess i just didn't baloon tip the correct hotspot.

-ral
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