Poly tools are great though :-D
Andy
> Andy,
> NURBS would have been the best method for this type of object. You are
> attempting to create what is called "complex curvature" in NURBS-speak.
> If you were looking for the interior scoop to meet accurate
> specifications, this example would be rather difficult to reproduce via
> polys or even subDs. Not impossible, just would require immense effort.
>
> This is a very rudimentary type of modeling procedure for Maya, and
> it's even easier in Studio than in Maya. It could be done quite
> accurately in most solids modeling apps but solids modelers are not
> typically known for their ease of use at the interface. Morten's
> solution was quite innovative but works well only if it doesn't matter
> if the interior scoop is warped by deformation.
>
> Admittedly I've barely touched NURBS in XSI in recent months so I used
> this example as a refresher. I was completely unsuccessful at
> replicating it via NURBS in XSI. I am surprised to see that XSI has an
> intersection fillet feature, but lacks simple multi-surface intersection
> to generate trim curves. I'm not sure what's up with that. I hope I am
> missing something there. XSI's NURBS seems to be a real mixed bag,
> possessing some very advanced features while lacking some of the most
> simple features required to do effective NURBS modeling. I would hope
> that the NURBS toolset improves in the future. I would certianly love to
> relax my dependence on Maya for NURBS modeling, especially since I'm
> finding it far more difficult to transfer NURBS from Maya to XSI than I
> had hoped.
>
> --
>
> Joey Ponthieux
> NCI Information Systems Inc.
> NASA Langley Research Center
> ____________________________________________________________
> Opinions stated here-in are strictly those of the author and
> do not represent the opinions of NASA or any other party.
>
>
> Andy Nicholas wrote:
>>
>> Yep, NURBS occurred to me too, but how would you do this in XSI? I know
>> XSI's NURBS aren't considered to be great, but is it even possible to
>> generate this shape in XSI with a NURBS cylinder, a sphere, and some
>> trim
>> curves?
>>
>> I gave it a go as a quick test, but there doesn't seem to be an obvious
>> workflow to generate this accurately.
>>
>> -----Original Message-----
>> From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
>> Of
>> Thomas Helzle
>> Sent: 22 May 2006 16:53
>> To: XSI(at)Softimage.COM
>> Subject: Re: simple shape - old problem - evil result
>>
>> Wow.
>> I'm really impressed by this listing, but may I ask if NURBS are an
>> option?
>> They do what you need very easily (although not those in XSI) and can be
>> imported into XSI for rendering via IGES.
>> NURBS are how those objects are modelled originally anyway...
>>
>> And if you want to forward your design to other companies, they will ask
>> for
>> NURBS most of the time, although rapid prototyping can be done from XSI
>> polygon models with fine subdivisions exported as .obj and then
>> converted to
>> STL. I did that some months ago for a lamp design.
>>
>> Rhino is very popular, although I personally prefer SolidThinking since
>> it
>> has a history (www.solidthinking.com).
>>
>> Just a thought though :-)
>>
>> Cheers,
>>
>> Thomas Helzle
>>
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