[Sidefx-houdini-list] Message 1 of Sidefx-houdini-list Digest, Vol 316, Issue 4

nicholas pliatsikas nicholas.pliatsikas at gmail.com
Mon Oct 10 09:00:03 EDT 2011


Hi Ben

Thanks for the info, we are doing much of that already. I disregarded
material ifds as i thought they where sop/component level only but ive
looked into after your self and sidefx recommended using them, and i figured
i can hack them into our workflow :¬) From my quick tests the ifds seem to
fly!!!
Thanks for help and lengthy reply :¬)

I thinks theres an RFE coming from me for an object level material IFD
output and a rendering parameter to point to the Material IFD path too would
be class.
Cheers
Nick


On Sat, Oct 8, 2011 at 7:06 PM, Benjamin Laidlaw <ben_laidlaw at hotmail.com>wrote:

>
> Hey Nick,
> I believe I have run into the same problem before. I def have my own
> massive ubershader, that controls our assets. Make sure you have saved
> cached code checked on in the edit operator type properties, at the bottom
> of the basic tab, to save your vops to code if that be the case. Second When
> doing instances point them to point to a geo object that is reading a
> delayed load through the procedural shader(shop_geometrypath) option, or add
> those parameters to your instance obj. Third output your shader (and
> geometry sometimes) through the mantra archive in the out network. This will
> create a delayed copy of your shader, especially if you have sequentially
> changing points to instance too and the shader does not change. One set call
> of the shader for all your points. Add point values of cd to spice it up.
> Also you should load your points to be instanced through this delayed load
> (vm_procedural) whether or not they be rop file output in sops, or through
> the mantra archiver, as long as the shop_material.... is set as an
> attribute. The only different between the mantra archiver and a sop geo rop
> is that the former does not output groups since the shop_material sets it.
> This way you can render your geo point .bgeo once(You can even gzip them to
> make them smaller for network traffic), and keep on changing the separate
> point ifds since they are referenced in. to your final scene ifds. I would
> strongly recommend any geometry read from disk go through the delayed load
> shop to decrease network bandwidth, never through a file node in sops. This
> way if you do iteration for the same shot you only cache it out once, not
> once to disk then the second into the ifds. You should be able to keep your
> per frame ifds down to under 1mb or around several hundred Kbs through this
> manner. Always exception but it works pretty well. I ain't a coder, but the
> code is relatively simple to look at.
> -Ben
> > From: sidefx-houdini-list-request at sidefx.com
> > Subject: Sidefx-houdini-list Digest, Vol 316, Issue 4
> > To: sidefx-houdini-list at sidefx.com
> > Date: Sat, 8 Oct 2011 12:00:01 -0400
> >
> > Send Sidefx-houdini-list mailing list submissions to
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> >
> >
> > Today's Topics:
> >
> >    1. using soho to generate ifd data for shopTypes. Then injecting
> >       a mantra IFD with the shaders from disk. (nicholas pliatsikas)
> >    2. sweep (zoran arizanovic)
> >    3. Re: sweep (Larry Giunta)
> >    4. Re: sweep (zoran arizanovic)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Fri, 7 Oct 2011 17:13:58 +0100
> > From: nicholas pliatsikas <nicholas.pliatsikas at gmail.com>
> > Subject: [Sidefx-houdini-list] using soho to generate ifd data for
> >       shopTypes. Then injecting a mantra IFD with the shaders from disk.
> > To: sidefx-houdini-list at sidefx.com
> > Message-ID:
> >       <CAO=
> SxRrgC6f4u8BO7NCYhLuLZsz7WCh9FAZpzvSNpT2YWC9m_w at mail.gmail.com>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > Hey guys
> >
> > Ive got a few questions about using soho and modifying how the shader
> > assignment/ifd generation of shader information is used.
> > Just to give you a little history on the problem we are attempting to
> solve,
> > its quite simple.
> >
> > We are using instances pretty heavily on one of our projects, we are also
> > using our standard ubershader with those instances, which has a massive
> > amount of shader parameters.
> > This seems to not work very well when generating IFDs, specifically it
> takes
> > a very long time to generate them so we are consistently hitting a mega
> > bottle neck.
> >
> > So I began investigating ways of optimizing things. During a quick search
> > online I discovered a great Russian site that has a brilliantly simple
> > solution for removing the need to generate instances all the time during
> IFD
> > generation.
> > http://www.2d3d.by/tools/22/
> > or in english
> >
> http://translate.google.co.uk/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.2d3d.by%2Ftools%2F22%2F&act=url
> >
> > Basically that tool allows you to write out an IFD per frame for all your
> > instances, this file is then added to a parm "vm_ifd_code" on any empty
> geo
> > and it will inject the instance ifd data into your renderable IFD. Very
> > clever :?)
> >
> > Now my issue with that is simple, it would be far more optimal if it was
> a
> > per frame export, yes its better then rendering IFDs with instances every
> > time. But we also have regular animation updates, and it does take time
> to
> > export for that also.
> >
> > The 3 valid options I can see is to create a similar setup to the above
> but
> > rather then exporting the IFDs for the instance object is to export a
> file
> > that contains just the shader information for one frame. Then add a parm
> > "vm_ifd_shader" that would load this in instead of recomputing the shader
> > everytime.
> > Ive not really messed with soho before. Im unsure how i would go about
> that?
> > so any tips would be great.
> >
> > Or instead of injecting it during ifd generation, maybe i could inject it
> > using a python filter, as long as i can access the object name that im
> > adjusting the surface for i can do that.
> >
> > So for the above i guess im asking, how can i generate the shader ifd
> > information using soho? Is it possible to patch soho to pick up the new
> parm
> > and assign that as the shop data for each instance?
> >
> > And how do i access the object names using python filtering?
> >
> > The last possibility would be to cache one frame of IFD for the objects
> we
> > are instancing then reuse that IFD data with the instance transforms,
> sounds
> > like the hardest of all though
> >
> > Any help with any of the above would be awesome :?) Its not really
> > documented much from what i can see either..
> >
> > Maybe someone has a better solution for the above issue?
> >
> > Thanks in advance especially if you have read this far.
> > Cheers
> > Nick
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Fri, 7 Oct 2011 21:03:29 +0200
> > From: zoran arizanovic <zoran.arizanovic at gmail.com>
> > Subject: [Sidefx-houdini-list] sweep
> > To: sidefx-houdini-list at sidefx.com
> > Message-ID:
> >       <CAJ5T-nqvgXEdh8mHZEdocPFjGcqG00jgdZUov6gEND1U=
> GAH0w at mail.gmail.com>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > hi
> > I would like to control thickness-diameter of crosssection circle
> > I have a circlethrough sweep sop  along dynamic curves and would like to
> > control it so  it goes gradually to zero on the top of a curve
> > so the sweeped geo would be the thickest at point0 and  zero scale at
> point
> > X-end point
> > thanks
> >
> >
> > --
> > Zoran Arizanovic
> > vfx reel : http://vimeo.com/28605448
> > http://www.imdb.com/name/nm2902303/
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Fri, 7 Oct 2011 15:29:30 -0400
> > From: Larry Giunta <larry at gcreativestudios.com>
> > Subject: Re: [Sidefx-houdini-list] sweep
> > To: sidefx-houdini-list at sidefx.com
> > Message-ID:
> >       <77FD6927-8880-4DD3-9446-9AD39106EBFE at gcreativestudios.com>
> > Content-Type: text/plain;     charset=us-ascii
> >
> > Hey Zoran,
> >
> > If I understand correctly, I've done something like this before by adding
> an expression in the scale parameter on the Sweep SOP.
> >
> > In my case I needed it to be consistent for most of the curve, then scale
> to a zero at the end. So I enclosed it in a clamp function.
> > Something like this.
> > clamp(($PT*.1), 0, 1.5)�
> >
> > Larry
> >
> > --
> > Larry Giunta
> > Creative Director
> > G Creative Studios
> > (978)276-0600
> > www.gcreativestudios.com
> >
> >
> >
> > On Oct 7, 2011, at 3:03 PM, zoran arizanovic wrote:
> >
> > > hi
> > > I would like to control thickness-diameter of crosssection circle
> > > I have a circlethrough sweep sop  along dynamic curves and would like
> to
> > > control it so  it goes gradually to zero on the top of a curve
> > > so the sweeped geo would be the thickest at point0 and  zero scale at
> point
> > > X-end point
> > > thanks
> > >
> > >
> > > --
> > > Zoran Arizanovic
> > > vfx reel : http://vimeo.com/28605448
> > > http://www.imdb.com/name/nm2902303/
> > > _______________________________________________
> > > Sidefx-houdini-list mailing list
> > > Sidefx-houdini-list at sidefx.com
> > > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> >
> >
> >
> > ------------------------------
> >
> > Message: 4
> > Date: Fri, 7 Oct 2011 21:39:55 +0200
> > From: zoran arizanovic <zoran.arizanovic at gmail.com>
> > Subject: Re: [Sidefx-houdini-list] sweep
> > To: sidefx-houdini-list at sidefx.com
> > Message-ID:
> >       <CAJ5T-no-z4-Q6kY32pXLHygRRec2MD=
> uyARMeatfbV5372RO+g at mail.gmail.com>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > thanks larry
> > :)
> >
> > On Fri, Oct 7, 2011 at 9:29 PM, Larry Giunta <larry at gcreativestudios.com
> >wrote:
> >
> > > Hey Zoran,
> > >
> > > If I understand correctly, I've done something like this before by
> adding
> > > an expression in the scale parameter on the Sweep SOP.
> > >
> > > In my case I needed it to be consistent for most of the curve, then
> scale
> > > to a zero at the end. So I enclosed it in a clamp function.
> > > Something like this.
> > > clamp(($PT*.1), 0, 1.5)
> > >
> > > Larry
> > >
> > > --
> > > Larry Giunta
> > > Creative Director
> > > G Creative Studios
> > > (978)276-0600
> > > www.gcreativestudios.com
> > >
> > >
> > >
> > > On Oct 7, 2011, at 3:03 PM, zoran arizanovic wrote:
> > >
> > > > hi
> > > > I would like to control thickness-diameter of crosssection circle
> > > > I have a circlethrough sweep sop  along dynamic curves and would like
> to
> > > > control it so  it goes gradually to zero on the top of a curve
> > > > so the sweeped geo would be the thickest at point0 and  zero scale at
> > > point
> > > > X-end point
> > > > thanks
> > > >
> > > >
> > > > --
> > > > Zoran Arizanovic
> > > > vfx reel : http://vimeo.com/28605448
> > > > http://www.imdb.com/name/nm2902303/
> > > > _______________________________________________
> > > > Sidefx-houdini-list mailing list
> > > > Sidefx-houdini-list at sidefx.com
> > > > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> > >
> > > _______________________________________________
> > > Sidefx-houdini-list mailing list
> > > Sidefx-houdini-list at sidefx.com
> > > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> > >
> >
> >
> >
> > --
> > Zoran Arizanovic
> > vfx reel : http://vimeo.com/28605448
> > http://www.imdb.com/name/nm2902303/
> >
> >
> > ------------------------------
> >
> > _______________________________________________
> > Sidefx-houdini-list mailing list
> > Sidefx-houdini-list at sidefx.com
> > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> >
> >
> > End of Sidefx-houdini-list Digest, Vol 316, Issue 4
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