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

Guillaume Laforge guillaume at alamaison.fr
Thu Aug 7 04:02:00 EDT 2008


Hi Pablo,

Yes I've got the same number of points but I need to control the time 
warp with an fcurve so "chf" expression to drive the index of a cache
SOP works better in my case, unless I miss something with the Time Warp 
SOP ?

Cheers

Guillaume

Pablo Giménez a écrit :
> Hey Guillaume, I don't know if the topology of your point cloud is changing,
> probably yes, but if this is not the case you can use the Time Blend SOP
> after  a Cache SOP and the you can use Time Warp SOP or Time Shift SOP to
> retime the animation, it works pretty well.
>
> 2008/8/6 Guillaume Laforge <guillaume at alamaison.fr>
>
>   
>> 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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>>>>>>
>>>>>>
>>>>>>             
>>>>> --
>>>>> Guillaume Laforge | la maison
>>>>>
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>>>>>
>>>>>
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