[Sidefx-houdini-list] instance question

Jordan Walsh jordan.h.walsh at gmail.com
Wed Sep 21 11:29:22 EDT 2016


if you have a packed prim setup in Houdini, saving to Alembic will do
Alembic instancing inside the file... After that im not sure... Maya I
think breaks all this nice work :(

Jordan

On 21 September 2016 at 11:29, Gerbrand Nel <g at cannonballbunny.com> wrote:

> Hey Jordan
> Sorry for the late reply, I only looked at it now.
> Unfortunately my goal posts have shifted.
> I need to get this scene to maya for render.
> Do you, or anyone else here know if I can create a scene in houdini, using
> packed primitives or instances, and get that into maya as instances rather
> than full geo?
> Thanks guys!
> Gerbrand
> 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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