[Sidefx-houdini-list] particle fluid kill plane

François Duchesneau sidefx at trinix.ca
Fri Aug 12 13:36:59 EDT 2016


Have a look at the Bounding tab in a Group Pop. You can plug a box that 
has orientation in it, as long as it's big enough to act as an 
"infinite" plane. Then tell your Kill Pop to just kill everything in 
that group.

On 08/12/2016 01:24 PM, Alvaro Castaneda wrote:
> If you want to kill them in the Y axis just use a delete SOP, change it to
> expression and use
> $TY < 0
> the cero is the Y coordinate, change it to whatever you need, also $TX for
> the X axis and $TY if needed
>
>
>
> On Fri, Aug 12, 2016 at 11:14 AM, Mark Elendt <mark at sidefx.com> wrote:
>
>> If you have the plane normal, (A, B, C), you can define an equation
>> for the plane:
>>      A*x + B*y + C*z + D
>> where D moves the plane up and down along the normal (from the
>> origin).
>>
>> If you take a point (x,y,z) and plug it into the equation, positive
>> values mean the point is above the plane, negative values below.
>>
>> So, in VEX:
>>
>>      cvex
>>      partitionplane(vector N; float D)
>>      {
>>          float dist = dot(@P, normalize(N)) + D;
>>
>>          if (dist > 0)
>>              addgroup("dist", @ptnum);
>>          else if (dist == 0)
>>              addgroup("onplane", @ptnum);
>>          else
>>              addgroup("below", @ptnum);
>>      }
>>
>>
>> On Friday Aug 12 at 10:03, Gary Jaeger wrote:
>>> no that would work. A kill plane is just that. A plane that kills the
>> particles. It can be at any arbitrary angle but generally I use them to
>> kill particles in the Y.
>>> I’ll see if I can figure that out :)
>>>
>>> Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
>>> http://corestudio.com <http://corestudio.com/>
>>>> On Aug 12, 2016, at 9:53 AM, François Duchesneau <sidefx at trinix.ca>
>> wrote:
>>>> I've never used Bifrost. What is the kill plane?
>>>>
>>>> If you're referring to a way of kill particles below a certain value
>> in Y for example you could use an expression in the Kill Pop but I suspect
>> what you're after is more sophisticated.
>>>> Francois
>>>>
>>>> On 08/12/2016 12:35 PM, Gary Jaeger wrote:
>>>>> Noob question. Is there an equivalent to the bifrost kill plane for
>> particle fluids?
>>>>> Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
>>>>> http://corestudio.com <http://corestudio.com/>
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>> --
>> Mark Elendt
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