Re: .obj unwelding polynodes

["Tim Leydecker" <BauerOink(at)gmx.de>]

It´s due to the Geometry approximation >Polygon Mesh>
Discontinuity Angle in XSI set at 60°, e.g. even two right
angled polygons will get an interpolated smoothing, making
the result look smooth across even a quite low geometry

Most of the time this looks better (in rendering) than Maya´s
default 30° smoothing angle, where the same object may
allready look quite facetted.

I must admit that since I´m using XSI and it´s powerful
subD workflow, I mostly build meshes for subdivision,
e.g. don´t care too much about polcounts but instead
just for the most pleasing result in terms of surface,
as mR/XSI will hardly ever slowly down in the Viewport
or in rendering of  those meshes.

Intrigued by your question, I just checked and can´t
find something similar (or at all) to all the tools in Maya´s
Edit polygons>Normals>menu entries

You´re right they would be really helpful to finetune a
mesh´s look without having to add geometry. Bummer...

I can´t find something like the smoothing groups in Max either.

Another feature request, maye? I think André Adam would
also be interested in this as well as having further ways to
influence the calculation and editing of Normals - like having them
modified by user, then locking them or editing them in gerneral?

Cheers

tim





----- Original Message ----- 
From: "Wayne Williams" <wayne.williams(at)theorphanage.com>
To: <XSI(at)Softimage.COM>
Sent: Saturday, February 17, 2007 3:03 AM
Subject: Re: .obj unwelding polynodes


> Thanks for the reply Tim. On a related note, is there a feature in XSI like the 
> Normals>Unlock Normals? When modeling hard surface objects I tend to just inset the 
> offending face that is giving a hint of warped normal and this fixes it. 
> Unfortunately this adds geo. In maya, just use that and the mesh seems to magically 
> look proper. If this feature isn't in xsi, is it intrinsically linked to there 
> being no direct connections between individual UV's? Perhaps this is also the 
> reason that the UV editor in XSI bogs way down with meshes that Maya just breezes 
> through interaction wise.....perhaps having to calculate all the extra data that 
> comes along with multiple bisectors is what causes this? I'm probably totally 
> incorrect so if anyone has a clue they can toss me that'd be great.
> -wayne
>
> ----- Original Message ----- 
> From: "Tim Leydecker" <BauerOink(at)gmx.de>
> To: <XSI(at)Softimage.COM>
> Sent: Friday, February 16, 2007 5:48 PM
> Subject: Re: .obj unwelding polynodes
>
>
> > Hi Wayne,
> >
> > I also asked this a while back, David Abbott and a few other´s
> > had some insights, the thread is labeled
> > Re: paste UVs - vertex order shuffled on file I/O?
> >
> >
> > I´ve no soultion to your problem but the above thread also holds
> > some info regarding the copy&paste UV function affected through
> > this, in short, it seems the polybisectors are a speciality of XSI, as
> > there are no direct connections  between individual UVs, hence there
> > are multiple polybisectors (storing the Normalsmoothing?) instead and
> > it is difficult to check which of the polybisectors to keep/convert to get
> > a continious UV shell required by Maya, so they just export multiple UVs.
> >
> > On import back into XSI, this may mean you´ll have to create an new,
> > empty UV set to be able to paste the UVs created in Maya into that
> > (onto your XSI mesh) as mixing the imported mesh´s UV - now lacking
> > the polybisectors - seems to be unsupported with an existing XSI UVmap.
> >
> > Or it´s something completely different...
> >
> > Basically, you´ve found it yourself allready, "merge UVs" in Maya
> > is the way to go, the threshold the knob to fiddle to taste with...
> >
> > Cheers
> >
> > tim
> >
> >
> > ----- Original Message ----- 
> > From: "Wayne Williams" <wayne.williams(at)theorphanage.com>
> > To: <XSI(at)Softimage.COM>
> > Sent: Saturday, February 17, 2007 12:18 AM
> > Subject: .obj unwelding polynodes
> >
> >
> > Ive uv'ed a model in XSI and the points are a welded in the uveditor so that when 
> > I island select it selects the whole island. I export the model as .obj to maya 
> > and upon import all the polynode bisectors are unwelded. Is this typical behavior? 
> > I realize I can just select all and weld with a very low threshold but what is 
> > causing me to have to endure this extra step each time? Is it the maya importer or 
> > the xsi exporter? Thanks!
> > -wayne
> >
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>
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