[Sidefx-houdini-list] instance question

Jordan Walsh jordan.h.walsh at gmail.com
Thu Sep 22 09:28:01 EDT 2016


Havent used that node for ages. There is the instancepoint() expression to
get the instance number so you can vary the geo on each point, but cant
remember the best way to use it.
I have use it to do time offsets on meshs before I swapped to using packed.

Jordan

On 22 September 2016 at 10:07, Gerbrand Nel <g at cannonballbunny.com> wrote:

> Hey Jordan
> This took some head scratching, but it works at sop level.
> I cant seem to get redshift to listen to instancing at sop level. it only
> seems to use the instancer you get at geo level.
> Is there a way to do it at geo level?
> Thanks
> G
>
> On 2016/09/19 1:04 PM, Jordan Walsh wrote:
>
>> If you save one blade of grass as a bgeo sequence you can load it by using
>> the instance SOP and having the file path as an attribute called
>> *instancepath*. You can just build this manualy and then create an
>>
>> expression for the framenumber part of it to be a random number with ptnum
>> as a seed, like this:
>> /path/mygeo.`padzero(4, ($F + floor( fit01( rand(@ptnum), 0, 50 )
>> )))`.bego
>>
>> Then you will get packed disk instances.
>>
>> Jordan
>>
>> On 19 September 2016 at 09:41, Gerbrand Nel <g at cannonballbunny.com>
>> wrote:
>>
>> Hey guys
>>> I need to make a grass field for a pre-rendered VR project.
>>> I would like to create a bend animation on a blade of grass, and then
>>> drive the animation of the grass field, using noise animated through the
>>> points I use to scatter the grass.
>>> If I use copy/stamping I can rescale the noise values to drive a
>>> timeshift
>>> node on the grass blade, but I need to use instancing, rather than
>>> copy/stamp.
>>> We are rendering in redshift so copy stamping doesn't work for this.
>>> I would like to know if there is a way to offset animations on instances
>>> in houdini.
>>> Hope that made sense.
>>> Thanks
>>> Gerbrand
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