JavaFX 3D : TriangleMesh specification questions

[Chien Yang]

HI August,


On 2/22/2013 6:39 AM, August Lammersdorf, InteractiveMesh wrote:
> Thanks Chien!
>
> - So, a single texCoord (0,0) referenced by all vertices would be 
> sufficient if no texture is specified in the PhongMaterial !?

That's correct.

>
> - Flat shading, triangles with all three edges creased, is just an 
> existing 3D rendering feature. Helpful to visualize face structures or 
> a red backlight glass ;-), etc..
>

Thanks. I have filed a feature request for it.
http://javafx-jira.kenai.com/browse/RT-28586

> - Wavefront's OBJ files (.obj) provide a smoothing group statement (s 
> 1, s 2, ..) to collect subsequent faces into the specified group. The 
> statement 's 0' or 's off' turns off smoothing and all following faces 
> must be rendered in the flat manner. If no number is reserved for flat 
> faces, assigning an exclusive number to each flat face should produce 
> the same result in JavaFX 3D.
>

Yes, that should work.

> - Even if a 3D file format supports smoothing groups, e.g. 3DS and OBJ 
> (Collada, VRML2, and X3D don't), its use isn't mandatory. 
> Alternatively normals or a crease angle might be delivered. Will 
> JavaFX 3D provide a smoothing group generator utility, as normals are 
> not implemented yet? Otherwise importer/loader have to include such a 
> feature.

Filed this too.
http://javafx-jira.kenai.com/browse/RT-28587

Thanks,
- Chien

>
> August
>
> Am Freitag, den 22.02.2013, 00:16 +0100 schrieb Chien Yang 
> <chien.yang at oracle.com>:
>> Hi August,
>>
>>      Please see my reply inline.
>>
>> On 2/21/2013 1:41 AM, August Lammersdorf, InteractiveMesh wrote:
>>> While converting 3D model importer following questions occurred :
>>>
>>> - Are texCoords and texCoord indices required even if no texture is 
>>> applied because NUM_COMPONENTS_PER_FACE is final and has a value of 
>>> 6 (3 point indices and 3 texCoord indices per face)?
>>>
>>
>> Yes, you will need to for JavaFX 8 since there is only one vertex
>> format. We have plan to add more in future releases.
>>
>>> - Are normals or other vertex attributes planned?
>>
>> Yes.
>>
>>>
>>> - Is flat shading supported? Does a corresponding smoothing group 
>>> number exist for the faceSmoothingGroups array (like '0' in *.obj 
>>> files)?
>>>
>>
>>  Flat shading isn't in our plan but we may consider it if you have a
>> good 3D use case. Can you elaborate your question on smoothing group
>> number?
>>
>>> - Must smoothing group numbers be consecutive and positive?
>>>
>>
>> No, we didn't specify much about its restriction. It may be good to
>> keep this within a small positive range. We may have to tighten later
>> as we work out some of the details.
>>
>> Thanks,
>> - Chien
>>
>>> Thanks, August
>