[Sidefx-houdini-list] tracking via cops/pic()

Ivan DeWolf ivan at martian-labs.com
Thu Aug 20 18:54:32 EDT 2009

try using the "trace" SOP instead

Quoting "jacob fisher" <jacobfshr at gmail.com>:

> Hopefully this will be a simple question I have and you all won't
> think less of me, but here goes.
> I have an image sequence I imported into COPs and I have it copied to
> a grid via a pic() command in the point node.
> What I'd like to do is have a reaction based off the movement of an
> object in the image sequence.
> As a sphere moves from right to left, I would like a particle
> simulation to occur.  However, I would like the particle simulation to
> be varied depending on how quickly the sphere is moving.  So if it's
> moving at 3 pixels/rows/columns/whatever a frame it will release more
> particles than if it moves at 1 pixel per frame.
> How would I go about tracking this?
> Thanks for any tips you can think of.
> -jake
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