[Sidefx-houdini-list] houdini, tiffs and txmake

Andrew D Lyons tstexture at gmail.com
Wed Dec 12 11:44:35 EST 2007


Good idea - I'll take a look at that.

I looked at the  HOUDINI_TIFF_BOTTOMLEFT env-var yesterday - but at
face value that seems to be more to do with output. I thought all the
tiff issues with Houdini were ironed out a while back - but I'll know
better soon...

Cheers



On 12/12/2007, Jeff Higgins <jeffrey.higgins at gmail.com> wrote:
> just out of curiousity have you tried using a jpeg in the GL shader to see
> if
> that shows up inverted... at least this will tell you whether this is a tiff
> issue issue?
>
> i'm pretty it is tiff and the way that houdini uses it, but never the less
> its worth a check and even then i'm sure using jpegs would be faster
> although they're capped at 4 channels per image and 8 bit depth, which may
> or may not be an issue for you.
>
> On Dec 12, 2007 4:15 PM, Andrew D Lyons <tstexture at gmail.com> wrote:
>
> > Well the thing is we are using the original tiff in the GL shader to
> > see the texture in the viewport, and the tx file for rendering in
> > prman. The tx was generated from the tiff - so they should be the same
> > - but it's inverted. The uv's seem right, so I don't want to mess with
> > them. I haven't really looked into it much. It's a problem someone
> > else is having, but I wanted to see if it was a common one...
> >
> > Cheers
> >
> >
> > On 12/12/2007, Phil Spicer <PSpicer at bournemouth.ac.uk> wrote:
> > > Hi Andrew,
> > >
> > > If this is the quirk I think it is, you have to invert the V coordinate
> > > either in the shader or on the geometry before the texture is applied to
> > > it.
> > >
> > > Kind regards,
> > >
> > > Phil.
> > >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: sidefx-houdini-list-bounces at sidefx.com
> > > [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Andrew D
> > > Lyons
> > > Sent: 12 December 2007 02:35
> > > To: sidefx-houdini-list at sidefx.com
> > > Subject: [Sidefx-houdini-list] houdini, tiffs and txmake
> > >
> > > Our prman .tex files are coming in inverted in Y when compared to the
> > > tiffs they were generated from using txmake.
> > >
> > > Can anyone shed some light on that? I'm wondering if I need to
> > > resurrect HOUDINI_TIFF_BOTTOMLEFT ?
> > >
> > > Thanks!
> > >
> > > --
> > > =======================================
> > > Andrew D Lyons | Digital Artist | http://www.tstex.com
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> > >
> > >
> > >
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> >
> >
> > --
> > =======================================
> > Andrew D Lyons | Digital Artist | http://www.tstex.com
> > =======================================
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-- 
=======================================
Andrew D Lyons | Digital Artist | http://www.tstex.com
=======================================



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