[Sidefx-houdini-list] munging IFD files

Drew Whitehouse drew.whitehouse at gmail.com
Wed Oct 21 23:21:40 EDT 2009

I guess my original approach will have to suffice, as I also need to know
which files are written during the render as well as read. The general idea
is to use something like rsync to get from, and put back, the files from
their original file system. The following bit of python script sort of works
to extract the file names, but how many of the  ray_*  commands have file
like parameters ? Are they documented anywhere ?

The idea is that all of the files start off on one machine under fprefix and
migrate to other machines with the same path, then are sync'd back again
post render.

ifdfile = 'test.ifd'

refs = set()

with open('test.ifd','r') as f:
    for line in f:
        if 'ray_property' in line:
            line = line.split()[2:]
            for p in line:
                if fprefix in p:
        elif 'ray_loadotl' in line:
            ref = line.split()[1]
            if fprefix in ref:
        elif 'ray_image' in line:
            ref = line.split()[1]
            if fprefix in ref:

refs = [r.strip('"') for r in refs]

print 'File like references ...'
for r in refs:
    print r


On Wed, Oct 21, 2009 at 10:21 PM, Mark Elendt <mark at sidefx.com> wrote:

> On Wednesday Oct 21 at 07:07, Mark Elendt wrote:
> > On Wednesday Oct 21 at 15:00, Drew Whitehouse wrote:
> > > Hi people,
> > > Is there any "robust" way to extract/modify every filename-like
> attribute in
> > > an IFD file ? Can it be done with mantra filters ? Can it be done
> quickly in
> > > a way that doesn't involve parsing / loading the (possibly huge) binary
> > > chunks in the IFD file ?
> > >
> > > I'm looking for a way to make IFD files transportable from one render
> farm
> > > to another. We've been doing it heuristically with python scripts, but
> with
> > > the new SOHO drivers they're now broken and I'd like to do it again,
> and
> > > more correctly this time. Any ideas ?
> >
> > You might want to check out Python filtering:
> >
> >     http://www.sidefx.com/docs/houdini9.5/rendering/python
> D'oh.  I didn't read "filename like" attribute.  Python filtering will
> most likely involve some parsing.
> Aside from Andrew's suggestion, you can also rely on Houdini search
> paths (i.e. don't specify full paths in the source).
> --
> Mark Elendt
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Drew Whitehouse
ANU Supercomputer Facility Vizlab

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