JavaFX 3D : TriangleMesh specification questions

[August Lammersdorf, InteractiveMesh]

 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)?

 - Are normals or other vertex attributes planned?

 - Is flat shading supported? Does a corresponding smoothing group 
 number exist for the faceSmoothingGroups array (like '0' in *.obj 
 files)?

 - Must smoothing group numbers be consecutive and positive?
 
 Thanks, August