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

Guillaume Laforge guillaume at alamaison.fr
Tue Aug 5 17:09:33 EDT 2008


Thanks a lot Sean,

The chf expression with a cache SOP using $FF and "blend position" gives lot of control !
I will also try your lattice trick, it sounds good too :).

Thanks again.

Guillaume


On Tue, 05 Aug 2008 18:52:23 +0100, Sean Lewkiw <Sean.Lewkiw at CIS-London.com> wrote:
> I suggest doing gross time-warps with a cache SOP using $FF and a chf
> function in the lookup or one of the time-warp SOPs.
> 
> To do finer timewarps, like warping the outer edges more than the inner,
> assign point colours to your above SOP chain(s), the use a multi-input
> VEX SOP to blend between the two warps according to point colour.
> 
> To get lag and overshoot, slap the above in a lattice or point lattice,
> and use CHOPs to manipulate the lattice instead.
> 
> Sean
> 
> 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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