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

[Vincent Marchetti]

The modified gears.x3d file as detailed below, is available at http://kshell.s3.amazonaws.com/x3d_dev/gears_rev20170527.x3d

Vince Marchetti

> On May 26, 2017, at 3:30 PM, Joe D Williams <joedwil at earthlink.net> wrote:
> 
> 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