in news:3e105c2d$1@news.povray.org Greg M. Johnson wrote:

> (1)  The docs suggest that normal indices are optional.  I just took
> a working mesh, added *only* a normal_vectors section, and got an
> error message about missing  normal_indices.

You can only do without normal_indices if the amount of vertices and 
normals is the same, as shown in the first example in "3.5.2.1  Smooth 
triangles and mesh2"

> (2)  IMHO,  you should build a complete, non-optimized mesh with all
> its components (i.e.,  normal_indices)  before optimizing it.   The
> way it's done in the docs leaves me totally confused as to what a
> normal_indices  is. 

The use of normal_indices is exactly the same as the use of 
face_indices, with one exception: a mesh2 with mix of flat and smooth 
triangles.

Ingo

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