[Sidefx-houdini-list] CHOP invalid source

Jerome Pastorello lordkarington0 at gmail.com
Wed Nov 22 08:45:03 EST 2017


Thanx a lot guys,

Indeed it works fine with a brand new scene without any traces of (Carbon) simulation.

Anyone knows a ressource where I could learn how to implement a vex smoothing algorythm ?

Many thanx anyway, not enough sleep prevent you from thinking the right way.

Jérôme




> Le 22 nov. 2017 à 14:16, Sean Lewkiw <slewkiw at cinesite.com> a écrit :
> 
> I have had a lot of trouble in the past with CHOPs force-cooking OPs that were not required.  Could it be possible that CHOPs is re-cooking your entire cloth sim?  I'd make sure that this sim is completely gone from the scene.
> 
> If all you need to do is smooth the jitter of a single point, object merge that into a new object.  Save it to disc, then in a brand new hip file load it (with a clamp on the frame range) and do your CHOP thing, save out and load in the original scene.
> 
> Sean
> 
> On 2017-11-22 5:04 AM, Jordi Bares wrote:
>> I may be shooting from the hip but, may be the approach should be that of a high frequency noise reduction taking in account the level of detail? A Laplacian based smooth could do the job (in a direct able way as well) without having to resort to the cloth transformation which I would bet won’t work for the reasons you state.
>> 
>> My 2 cents
>> 
>> jb
>> 
>> 
>>> On 22 Nov 2017, at 09:39, Jerome Pastorello <lordkarington0 at gmail.com> wrote:
>>> 
>>> Hello,
>>> 
>>> 
>>> I have a very strange problem of CHOP.
>>> I did some quite heavy cloth simulation that I wanted to stabilize in my scene, jI just compensated the general movement and keep the cloth at the center of the scene by using a simple bound sop and inverting transform the cloth position to the center of its bounding box.
>>> 
>>> Then I wanted to smooth the movement of this point Position (une point only, so 3 channels) because the cloth BB is changing pretty strongly through time.
>>> 
>>> When I import the point with a geometry chop in chops I get an invalid source error, I thought it was coming from the file cache sop so I tried to copy some regular point on it, it kind of worked once, but now it is just calculating a « read back > loading geometry » for ages then I get the error again.
>>> 
>>> I am quite stuck on this with a validated by the client scene. Doesn’t seem to be a logical behaviour at all.
>>> 
>>> Is there any other way to smooth the animation of a point without going to CHOP ?
>>> Is there a specific limitation to chops import ?
>>> 
>>> Many thanx.
>>> 
>>> Jérôme
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> 
> Sean Lewkiw
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> 
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