[x3d-public] shows in Cobweb, BS Contact, FreeWRL. Does not show in X3DOM, Octaga, Instant Reality

[Joe D Williams]

can you attach that file, or give a link?
Thanks,
Joe

----- Original Message ----- 
From: "Vincent Marchetti" <vmarchetti at kshell.com>
To: <yottzumm at gmail.com>
Cc: "X3D Graphics public mailing list" <x3d-public at web3d.org>
Sent: Sunday, April 30, 2017 6:49 PM
Subject: Re: [x3d-public] shows in Cobweb, BS Contact, FreeWRL. Does 
not show in X3DOM, Octaga, Instant Reality


> The file 'gears.x3d':
>
> 1. Has one IndexedFaceSet. The coordIndex has 14544 integer items, 
> and every 4th item is -1 -- indicating the face set is 3636 
> triangles (for a converted STL, it should be all triangles; so far 
> so good)
> 2. The normalPerVertex field is false
> 3. The normalIndex field has 7272 entries, and every second entry 
> is -1. However, according to the 3.3 specification, section 13.3.6; 
> for the normalPervertex = false case there should be one
> index for each face. The -1 end-of-face entries in the normalIndex 
> field should not be there.
>
> I have found that if I just delete the -1 values in the normalIndex 
> field, the resulting x3d model renders ok in InstantReality 2.8 and 
> in Xj3D.
>
> While the original gears.x3d file passes the X3D Validators, if you 
> open gears.x3d in X3D-Edit and try to edit the IndexedFaceSet node, 
> you get error messages indicating that the -1 end-of-face entries
> in the normalIndex field are incorrect.
>
> Vince Marchetti
>> On Apr 30, 2017, at 4:59 PM, yottzumm at gmail.com wrote:
>>
>> Derived from an online free STL file, attached.
>>
>>
>>
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