[Sidefx-houdini-list] CAD to Houdini

Jed Schwartz jed at jedschwartz.com
Mon Oct 2 10:35:32 EDT 2006

Many thanks to all for the great feedback-!


On Oct 2, 2006, at 10:01 AM, Jerry wrote:

> If you have maya, there is a route you can go which i've used a  
> couple of times.
> I've never tried it with trimmed surfaces though, but i'm sure  
> there's a workaround if you can separate the
> trims out.
> Anyway it goes something like this.
> Open the surfaces in U and V in maya, then convert to poly. export  
> as an obj. Load obj into houdini then
> convert to nurbs and close in U and V.
> Is a bit cumbersome, but i've found it works pretty well.
> Hope that helps
> Jerry
> John Coldrick wrote:
>> On Monday 02 October 2006 09:19, Peter Robbinson wrote:
>>> I would try the .iges route next. That format is more closely  
>>> associated
>>> with CAD conversions and there are usually more options for
>>> them to control the conversion.
>> 	You'll need two things for this - possibly three.  We've just  
>> been through this and ended up with(unfortunately) polys because  
>> we didn't have a lot of control or time over the source files 
>> (originally ProE).  We got Polytrans, which is great, but while it  
>> reads ProE files natively, that won't help you get it to an IGES  
>> format readable by Houdini(esp with trim surfaces).  You need to  
>> get IGES files saved out by whatever program is being used to  
>> design the files, then run them through Polytrans, which has it's  
>> strength in being able to beat up any of the hundreds of mangled  
>> IGES variants out there(and there are hundreds).  Unfortunately,  
>> I'm not sure you'll be able to take advantage of exporting into an  
>> IGES file readable by Houdini - you'll need to import directly  
>> into Maya(!) because that's the only one they support directly.   
>> Getting it from Maya to Houdini may be troublesome in itself.
>> 	Bottom line, it's a bitch.  It *really* depends on the flavour of  
>> IGES, and as mentioned the state of that format is a mess when  
>> going between packages.  You might try IGES and it will work first  
>> time.  It probably won't.  Importing IGES trim surfaces from  
>> Polytrans directly into Houdini resulted in a mess.  Everyone  
>> complains about Houdini's handling of IGES, but after this  
>> experience, at least I understand why.  The main guy at Polytrans  
>> has been focused heavily on IGES for many years - it's a full time  
>> job.
>> 	Personally, I'd like to get the Polytrans guys talking to SESI,  
>> not sure when that will happen though.  They're right here in  
>> town, guys.  :)
>> 	Cheers,
>> 	J.C.
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