in news:3bb70b9a@news.povray.org Rune wrote:

> But anyway, I've just remembered the ultimate argument why it can't
> be done in SDL, at lest not for smooth meshes:
> 
> In order to transform a normal, one has to know the corresponding
> vertex. However, in mesh2 each normal can be assigned to several
> vertices. Thus it is impossible to transform the normals of mesh2
> in the SDL. 
> 

 Yes, they can be assigned to several vertices, but they don't have to 
be! Nothing stops you from writing a mesh that specifies a normal per 
vertex in the normal_vectors / normal_indices. Also it shouldn't 
be too difficult to 'un-optimise' a given mesh, using a script.

Ingo

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