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

Sebastian H. Schmidt sebastian.h.schmidt at googlemail.com
Thu Aug 20 18:51:00 EDT 2009

hey jacob,

i would try this approch, ...

1) get the acceleration how fast the color changes, the higher, the more
particles should be emittet,
2) isolate the pixels that have the color of your sphere
3) i guess it just makes sense to use the pixels that are at the edge of the
sphere in the image, since it is there where the change in color is going to


On Thu, Aug 20, 2009 at 11:31 PM, jacob fisher <jacobfshr at gmail.com> wrote:

> 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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