[Sidefx-houdini-list] Detect high frequency areas in CHOPs

François Duchesneau sidefx at trinix.ca
Thu Sep 22 11:17:49 EDT 2011

You can kill the high frequency directly in chop but if you need to 
create an attribute that hold an attribute of how much a jittering 
occurs I guess you can compare the curves before and after the Filter 
Chop, find the maximum difference you've got among all the points and 
remap this into 0-1.


Pablo Giménez wrote:
> Hi all.
> I am tracking some points positions using chops.
> This points moves towards a goal, every point has a different goal.
> When they are close to theirs goals, because I am using forces, they begin
> to oscillate around them. I have some kind of dampening that is working and
> tends to stabilize points, but it needs some time to do it.
> So I was thinking about using chops to detect when I have points oscillating
> around their goals.
> As expected I got channels that shows the initial movement towards the
> target, with high amplitudes, then when a point is close to its goal I got
> small amplitudes and high frequencies.
> Hou can I detect this areas so for instance get a channel that goes from 1
> to 0, 1 when point motion has low frequencies and 0 when it has high
> frequencies.
> Any help is welcome. Thanks!

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