how could be this done in houdini?

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hi, i was wondering how could be this done in houdini with particles:

http://www.youtube.com/watch?v=KYDUUFwtyMM&feature=featured [youtube.com]

i gues is just about giving some custom cos or sin operation to the position of an emiter, but how could be that operation?
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Hi,
You can try using cos e sin functions in a transform sop to drive a particle source, a disk for example.

I'm sure there are more elegant methods

Attachments:
test_parametric_plot.hipnc (40.6 KB)

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There used to be a spirograph HDA posted around here somewhere. But for the life of me, I can't find it anymore.
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This can be helpful, if someone wishes to do one…

http://maxwelldemon.com/2010/01/14/spirographs-and-the-third-dimension/ [maxwelldemon.com]
Every journey starts with one step…
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You could create an emiter and target (Look At) it towards a null where you either manually type in a cos and sin expression in the tx and tz channel, or apply a motion effect to thos channels.
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amazing john z very amazing, yet simple, and thanks everybody for your responses.

an usefull little toy.
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