[Sidefx-houdini-list] Houdini or Python question

Ken Ouellette ken.ouellette at gmail.com
Mon Oct 27 09:48:50 EDT 2008


My suggestion is hacky but it will work, it was done in 8.### not 9.5 so
things might be a bit different.

I was trying to do a similar to obtain the start/end of a sequence of images
on disk. I encountered cooking problems trying to update the filename
parameter a few times on an existing node. The start/length paremeters were
not updating even with a "-C" on the opparm line so I ended up constructing,
via hscript, a composite network from scratch. I created a FileCOP and
feeding it a file input, opparm FileCOP 'foo.\$F.tif', then I could set a
few variables to the start and length ( set startFrame =
`chs("./FileCOP/start")` set lengthFrame = `chs("./FileCOP/length").

Once I had the information I wanted I opcf'd up and out of there and deleted
my temporary network.

I haven't tried running a OS command from a parameter in a while, but just
be aware that last time we found that it was actually being eval'd every
frame so it can be a bit of a slowdown for your network. It maybe more
direct but it might be one of things you don't really want to take a time
hit on.

hope that helps.

On Mon, Oct 27, 2008 at 8:55 AM, Nicholas Pliatsikas
<nick_p102 at hotmail.com>wrote:

> Hi people,
> In the houdini file browser with show sequences as one entry set to on, we
> can see all sequences collated together including its file range. I.e
> C:/image.$F.bgeo (10-81).
> We would like to grab the range information (10-81). Ive noticed that the
> file cop has a detect range button, but im not sure how that works?
> Is there any hscript or python functions/methods that can return a
> framerange from a file sequence? Or do i need to do this my self with a loop
> and file check?
> I could create my own fileLoader button that will run a python callback
> script. Listing the whole directory, matches the selected file name to any
> file in the directory, Sort the list then strip out the last set of digits
> and gets its range from that. But I was wondering if there was a better way
> todo that? Maybe an os function?
> Theres no information in "kwargs" either when i print the returned value of
> a file parm which would be a great place to get the required information
> from. It could have had a range or return None for a sequence but
> unfortunately not :¬/
> Any help would be great, doing a more longwinded version is of course is
> not a big problem but of never as nice as a more direct approach :¬D
> Cheers
> Nick
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