[Sidefx-houdini-list] Time warping a point cloud

Guillaume Laforge guillaume at alamaison.fr
Wed Aug 6 07:02:03 EDT 2008


Lot of very good advices. I've got much more control on my little points 
now :).

Thanks Ben.

Cheers

Guillaume


Ben Schrijvers a écrit :
> And for the time warping... uhm... maybe use an animation curve instead 
> of $T  :-)
>
> Ben Schrijvers wrote:
>   
>> Hi there,
>>
>>  I just gave that a go and you just need to set the geometry CHOP's 
>> start and end paramers to $T.
>> In that way it just reads the current frame.
>>
>> With time slicing and things like lag, jiggle etc you can only play 
>> forward so I geuss you bring back the channels into sops and render out 
>> a point cloud sequence again.
>>
>> cheers,
>> benS
>>
>>
>> Guillaume Laforge wrote:
>>   
>>     
>>> Hellooooww Ben :),
>>>
>>> The timeslicing option sounds interesting but I can't find a way to activate this parameter directly in the geometry CHOP.
>>> It is possible to turn it on in the lag CHOP but the memory could be full before this node :-/.
>>> I'm at home know, so I can't test on my point cloud sequence. I will let you know how it works tomorrow.
>>>
>>> Thanks.
>>>
>>> Guillaume
>>>
>>>
>>> On Tue, 05 Aug 2008 20:01:16 +0200, Ben Schrijvers <ben.schrijvers at guerrilla-games.com> wrote:
>>>   
>>>     
>>>       
>>>> Bonjourrr...
>>>>
>>>> For the time warping part you indeed are better of with a sop method.
>>>> For CHOP's tou might consider looking at timeslicing. Each CHOp has a
>>>> toggle in the last tab.
>>>> Not sure if it's documented somewhere but I believe it means it's just
>>>> keeping a few frames in memory.
>>>> Not all CHOP's will work but things like lag, jiggle or spring will.
>>>>
>>>> cheers,
>>>> benS
>>>>
>>>> Guillaume Laforge wrote:
>>>>     
>>>>       
>>>>         
>>>>> Hi,
>>>>>
>>>>> I'm trying to do some time warping on a bgeo sequence  of points coming
>>>>> from a fluid simulation. I thought that I could use CHOPs to control the
>>>>> motion but
>>>>> unfortunately when I reference my bgeo file in a geometry CHOP, it gives
>>>>> an error or crash Houdini. I've got 7000 points in my bgeo files and a
>>>>> duration of 120 frames. Maybe it is to much data to handle in CHOP ?
>>>>> I tried the Timewarp SOP too but it gives less control than CHOPs (no
>>>>> lag, jiggle etc...).
>>>>>
>>>>> Any advices to setup a time warping on a bgeo sequence of 7000 points on
>>>>> 120 frames is welcome !
>>>>>
>>>>> Thanks
>>>>>
>>>>> Guillaume Laforge | la maison
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>>>>>
>>>>>
>>>>>       
>>>>>         
>>>>>           
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>>>>       
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>>> --
>>> Guillaume Laforge | la maison
>>>
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