[Sidefx-houdini-list] Arnold .ass sequences and Houdini instances

Frederic Servant frederic.servant at gmail.com
Fri Apr 22 08:16:35 EDT 2016

Hi Pierre,

This question might be better suited for the HtoA mailing list, I can
register you if you want. It's also fine to contact our support directly at
support at solidangle.com.

For the "instance" attribute case, the fact you need to set load_at_init
probably means your procedural bounding box is not correct. It's fine to
use load_at_init anyway.

The instancepoint() function won't work because you are doing fast point
instancing, which is the right thing to do since full point instancing is
disabled in HtoA anyway.

The only practical way to instance .ass file sequences is with the
"instancefile" attribute, and the error you are getting looks like a bug to
me, I've created https://trac.solidangle.com/htoa/ticket/776 to look into


On Wed, Apr 20, 2016 at 3:06 PM, Pierre Rousseau <pierrot.rousseau at gmail.com
> wrote:

> Hello, I posted this questions on the sidefx forums yesterday but
> I thought I might as well ask it on the mailing list :).
> Does someone know how to instantiate an .ass file sequence in Houdini that
> works with motion blur?
> Setting a "instancefile" attribute on the points to load geo directly from
> the network works but only if I don't render with motion blur. Otherwise, I
> get an error. Rendering in local works but the ass file creation fails.
> 00:00:00 1017MB ERROR | AiArrayGetMtx: out-of-range error in
> src/pygeo/arnold/instancer.cpp at line 604
> If I use an "instance" attribute instead and load an .ass file with an
> "arnold_procedural" node, I can make it work but only if I check
> "load_at_init", a parameter I can't get if I load directly the files from
> an attribute in my instancer. Everything would be easy if I needed static
> objects but I need a sequence. I tried the "instancepoint()" function in
> the path of the sequence on the "arnold_procedural" but it always returns
> -1, probably because that parameter is used inside the node at SOP level.
> If anybody has an idea on how to make it works, it would be greatly
> appreciated [image: Smile] .
> Thanks!
> Pierre
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