[Sidefx-houdini-list] different forces on different wires

Gerbrand Nel g at cannonballbunny.com
Wed Jun 1 03:20:30 EDT 2016


Hey Todd
Thanks for looking
I looked at the scene and nothing seems to be happening.
What do you mean by "force point attributes" ?
Sorry, I feel like I'm being such a noob on this, but the solution is 
just out of my reach :P
G
On 31/05/2016 18:41, Todd Akita wrote:
> Well this will solve the grouping (grouping based on whether a point 
> in the prim has gluetoanimation).
>
> You'll probably will need to use the force point attributes to drive 
> the wiresolve...
>
> -T
>
> On Tue, May 31, 2016 at 12:01 PM, Gerbrand Nel <g at cannonballbunny.com 
> <mailto:g at cannonballbunny.com>> wrote:
>
>     Thanks Todd
>     I must be missing something.
>     Thanks for looking.
>     G
>
>     On 31/05/2016 17:45, Todd Akita wrote:
>
>         Gerbrand -
>
>         To clarify, you could attribpromote from point to prim (as
>         maximum), or use
>         a prim() expression in a popgroup node or the popwind force
>         itself.
>
>         Or you could also attribpromote it back from prim to point and
>         then do
>         something with that attribute...
>
>         but sure I could look at it.
>
>         -T
>
>         On Tue, May 31, 2016 at 10:46 AM, Todd Akita
>         <theakita at gmail.com <mailto:theakita at gmail.com>> wrote:
>
>             Gerbrand -
>
>             If you have a point attribute on the hair such as
>             "gluetoanimation" you
>             can just attribpromote that to prim and use that to set
>             your grouping.
>
>             -T
>
>             On Tue, May 31, 2016 at 10:11 AM, Gerbrand Nel
>             <g at cannonballbunny.com <mailto:g at cannonballbunny.com>>
>             wrote:
>
>                 Hey Matt
>                 Long time :)
>                 Thanks for the suggestion!
>                 Problem is that our hair is in wind before the cut.
>                 Is there no way to set groups and only affect the
>                 grouped wires?
>                 I miss my state machines from soft right now :
>                 G
>
>                 On 31/05/2016 16:04, Matthew Kearney wrote:
>
>                     Hey Gerbrand,
>                     One possible approach would be to set the density
>                     attribute on the 'cut'
>                     wires to a ridiculously low value and have a wind
>                     force that is light
>                     enough that it doesn't affect the other hairs.
>
>                     This worked a while back on a somewhat similar
>                     setup, but it did take a
>                     bit
>                     of fiddling to find the right balance between the
>                     wind and densities of
>                     the
>                     wires.
>                     I also increased the kangular and klinear values a
>                     lot to balance the
>                     loss
>                     of density.
>
>                     it was a quick hack but did the job - hope it helps!
>                     Matt.
>
>                     On 31 May 2016 at 15:36, Gerbrand Nel
>                     <g at cannonballbunny.com
>                     <mailto:g at cannonballbunny.com>> wrote:
>
>                     Hey guys
>
>                         We have to create a scene where hair gets cut
>                         by flying objects
>                         I've managed to detach the hair by using a sop
>                         solver.
>                         Inside the sop-solver I just do a attribute
>                         transfer to set the
>                         attribute
>                         "gluetoanimation" from 1 to 0.
>                         This works well, but I now need to apply a
>                         wind force to only the
>                         severed
>                         hair.
>                         How would I do this?
>                         It feels like it should be easy, but we can't
>                         figure it out
>                         Please help my dumb-ass :)
>                         G
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