| SideFX

non-hardened environment variables in IFDs? 8 years, 3 months

Darran Edmundson

Is it possible for Houdini to *not* expand environment variables when writing to IFD? More generally, what options are there for dealing with relative paths when moving from one's local machine over to a render node? For a given project, I tend to create a directory tree with one or more .hip files in the root folder. Resources are then referenced as $HIP/shaders, $HIP/maps, etc. In the ROP, I'll then prepend my output filenames with $HIP/render/diff, $HIP/render/spec, etc. This works great on the local machine. However, writing to .ifd, the $HIP (or any other environment variable) gets expanded. My hack is to run a post-render script that does a search/replace of the hardened strings, converting them back to envvars. Of course this only works with ascii IFD. I'd be very interested in hearing how others deal with path issues ... Cheers, Darran. P.S. I've got a nagging suspicion that I asked a similar question on the list last year. Can't find a reference to it in the archives though. -- Darran Edmundson [darran at edmstudio.com] http://www.edmstudio.com

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5 participants
8 comments

particle formats: what is the best free/open format to go maya to houdini? 8 years, 7 months

K S

hi, i was wondering if anyone has insight or experience what is the best free/open format to go from maya to houdini on back? We were considering maya .mc and point oven .mdd but not so sure they are open formats. We are trying to write code that already exists... Are there any other formats worth considering? Best Regards, katrin -- GRATIS f?r alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01

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21 participants
46 comments

houdinis s3d camera rig, converged or lens/plate shift? 8 years, 7 months

Graham D. Clark

Hi, Sorry Im on set today without a pc to download Houdini to check. I recall the stereo 3D rig in houdini has interaxial adjustment and another setting for the zero plane. Is Houdini setting that plane by converging/rotating the cameras? or does it have an option for shifting the lens or film plate (individually to be useful for stereo effect)? Thank you, Graham -- Graham D Clark, phone: why-attempt, s3d phone: fad-take-two http://www.linkedin.com/in/grahamclark

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3 participants
3 comments

Forward Kinematics in Houdini 8 years, 8 months

Pablo Giménez

Hi. Looking at the implementation of forward kinematics in Houdini, and comparing with Maya. What is the reason because FK is implemented as individuals IK per bone???? No kinetamitcs in Houdini is like FK in Maya, why this different implementation, pros and cons??? The only eason I can think about is to enable to animate FK using translations of effectors or goal nulls rather than directly rotate the bone itself. Whata re the benefits of this point? I am very new to rigging, so sorry if I am missinbg something. Thanks -- Un saludo Best Regards Pablo Gim?nez

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5 participants
17 comments

set intial state in dops 8 years, 8 months

paul flanagan

Hey, Is there an equivalent to maya fluids "set initial state" for Density, velocity, temperature etc in a dops simulation.... also can one sim from a minus frame number.. trying to come up with a preroll strategy... thanks. p,

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7 participants
11 comments

advice on a "set shot" workflow in windows!??!! (WTF) 8 years, 8 months

Robert Kelly

Hey Peeps So i am her in a medium size studio that is new to houdini and windows based, there is 2 of us here and we could do with a set shot workflow. The regular answer in a studio that is running anything but windows is a bunch of bash scripts. So is the answer use cigwin and what about the render nodes? This is probably a huge topic but why not scratch the surface. I have minimal bash scripting experience but am comfortable in Python so any ideas? Robert.

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20 participants
53 comments

Rendering NURBs... again... 8 years, 9 months

Antoine Durr

Have you verified that the patch bases are the same in Houdini as they were in Rhino? If the basis order got inadvertently changed, e.g. from 4 to 3, or even just on the trim curve itself, that might explain the separation artifacts you're seeing. -- Antoine Abdelkareem Abonamous wrote: > I'm sure that this topic has come up before (heck, I might have > contributed to that at some point, just can't recall any of it). > > Trying to render NURBs straight as NURBS (as opposed to pre- > tessellating). And I keep running into artifacts, specially around > trim edges (tiny gaps between the trimmed surfaces). The models come > in as IGES out of rhino, and both rhino and 3dsmax render them without > artifacts at all, but despite my hardest effort (using all sorts of > weird coving/no-coving/dicing methodology voodoo), I can't make the > gaps disappear. Converting to polys is prohibitive due to very heavy > models and big closeups. I thought that IGES might be the issue > (accuracy), so I scaled up the original in rhino by about 100, > exported it then, and the same problem shows up. And besides, 3dsmax > dealt with the same IGES file just fine. > > It's immensely frustrating and It's driving me insane :D FYI I'm > rendering in micropoly mode and there is no raytracing involved so far > (so it can't be a raytracing bias issue). Any tips out there? > > cheers, > Abdelkareem > _______________________________________________ > Sidefx-houdini-list mailing list > Sidefx-houdini-list at sidefx.com > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list

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2 participants
1 comments

Disable point display for ghost object 8 years, 9 months

P. Alex Lim

Hello. Does anyone know if there is an option (including fiddling with config file) to allow for the display of geometry's point inside the current SOP context only, but have the points display turned off for "Ghost Other Objects" and "Show All Objects"? At times I find it quite annoying when I just wanted to see how the points in current Objects are behaving by checking against geometry in other Objects, but unfortunately, turning on point display will turn everything on for other objects as well... Thanks! Alex

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5 participants
6 comments

image based fracturing 8 years, 9 months

Kursad Karatas

Hi I do not know how your source image looks like or how complicated it is but it might be just easier to save every piece of crack in the source image as separate sequential images without changing the image ratio.Then use trace sop on all images. Once you have clean separate pieces, it should be easy to merge all the traced pieces into a single geometry with individual centers. Another way to deal with the crack source image is using some vector drawing application to trace your image. This way you might be able to create a better and cleaner source. Most of those apps will export .ai(Illustrator) which you can import into Houdini. I know that Inkscape(free) does have a nice image tracer. cheers kursad >On 28 April 2010 16:19, Jim VanAllen <jimvanallen at gmail.com> wrote: > > Hi, > > I'm trying to figure out the best way to take an image of some > cracks > (like broken glass), and use it to break up a mesh in Houdini. I've > used some of the other techniques for fracturing a mesh, but we're > trying to figure out this specific problem, and my Houdini memory is > failing me at the moment. > > Any ideas? > > - jim > _______________________________________________ > Sidefx-houdini-list mailing list > Sidefx-houdini-list at sidefx.com > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list >

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1 participants
0 comments

Curve from Particle 8 years, 9 months

Stephen Jones

Hello all, I have a question about creating a curve from a POPnet. I have created a particle simulation that has a 5 particles force along a curve path. Those particles split creating a trail of points. I would like to make each particle trail into it's own curve that I would be able render out and taper at the ends based on $PSCALE. Any help would be greatly appreciated. Cheers, Stephen stephen at jonesvsfx.com P.s. This is why I don't use Maya. Because great resources like this, don't exist. HOO-RAY for SDFX!!!!

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3 participants
2 comments

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sidefx-houdini-list April 2010