Glass and glossy glass are provided only by the indigoShader at this time. For other materials I always use Maya's lambert and phong, and layeredShaders.
Again I am much willing to improve this aspect of MtI and we will discuss the ways together soon. But more than concerned, I am worried about eventual show-stoppers. Even more since no images are posted. It's not a blame but a matter of concern for me as an exporter writer
As long as there is no bug-fixing required I am willing to develop aspects of interest for users. Only users will declare MtI stable.
Update:
- display layers support for geometries
- sphere primitives
Sphere primitives are nurbs spheres with just a makeNurbsSphere as history (the default).
Sphere primitives in Indigo do not deform and can not be scaled non-uniformly, nor displaced. They render faster than polygon spheres and with a smaller memory footprint.
Nurbs surfaces will be supported soon through render tesselation. This will come with their currently lacking UI.