[Sidefx-houdini-list] changed inputs

Chris Mangnall cm at dneg.com
Mon Jun 4 07:18:06 EDT 2007

Hi Edward,

  Attached is a simple SOP and hip file.  Changing the topology of the 
grids triggers a change, but simply translating them around doesn't...

I'm using houdini 8.2.66 and uname -a
Linux henley 2.6.17-1.2143_FC4smp #1 SMP Mon Jul 31 17:51:15 BST 2006 
x86_64 x86_64 x86_64 GNU/Linux

Edward Lam wrote:
> Hi Chris,
> It should work. Try stripping your problem down to as simple a SOP as 
> possible first. And if that doesn't work, try posting your simple code 
> to the list. Make sure you're giving it the correct input index. :)
> I assume you're using Houdini 7.0 or later though. In earlier 
> versions, it would only work for a single input.
> -Edward
> Chris Mangnall wrote:
>> Hi - HDK question...
>> Is there a reliable way to determine if a SOP input has changed at 
>> all?  I'm using duplicateChangedSource(...) and fetching the 
>> 'changed' flag, but the flag returns 0 if i just transform/edit the 
>> input points.
>> I'm writing a three-input deformer SOP, and there's a whole bunch of 
>> heavy processing that only needs to be done if either of the first 
>> two inputs have changed.
>> c
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