[Sidefx-houdini-list] CHOP HDK Question

Chip Collier photex at gmail.com
Fri Nov 7 12:08:38 EST 2008

Ok, no sooner asked than answered. :)

So the line: OP_Node::flags().timeDep = 1;
Within my cook method now will correctly update values whenever a  
frame changes. Which is good when used in combination with the record  
CHOP and I can see ways to put this to use, but it wasn't originally  
how I pictured things operating.

I'm assuming now that I'd really need to base my OP on  
CHOP_RealtimeGenerator in order to get updates regardless of the frame  
changing. Is that correct?


Begin forwarded message:

> From: Chip Collier <photex at gmail.com>
> Date: November 7, 2008 11:42:19 AM EST
> To: Houdini 3D animation tools mailing list <sidefx-houdini-list at sidefx.com 
> >
> Subject: CHOP HDK Question
> Hi all,
> Wrote my first OP yesterday and today I am trying to make it  
> behave. :)
> The CHOP is a client for OpenSoundControl packets sent over UDP and  
> at the moment I only bother to get one channel working before I try  
> to expand support. Which I figured would be pretty easy. (ha!!)
> What I'm curious about is how to have instantaneous feedback. At the  
> moment I can send however many packets I want but unless I adjust a  
> parameter or toggle activation I don't see a change in the value.
> Looking at the samples, the Puppet CHOP uses CHOP_RealtimeGenerator  
> as a base but the CHOP_FifthGlove doesn't so I'm not sure if that's  
> a requirement for what I'm looking for.
> If I modify my offset parameter, I see the graph update, and when I  
> pass it through a record CHOP I get exactly what I expect but I  
> won't see the influence of the value I'm getting from the network  
> until I deactivate the CHOP or otherwise manipulate the OP which I  
> assume forces a recook.
> Currently I'm running a packet listener in another thread that  
> analyzes any UDP packets to see if they match the OSC address  
> requested and take whatever value was sent. Do I need to manually  
> invoke cookMyChop or somehow let Houdini know I've got new data?
> Another question is whether it's even worth threading out the  
> network code and only check for data during a cook?  I wasn't sure  
> of a more reliable way to not miss packets and also not block Houdini.
> Cheers,
> Chip

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