[Fluxus] lighting of build-polygons

[gabor papp]

> This turns out to be right; (colour) will only affect a shape where the
> normals have been set correctly, otherwise only the combination of setting
> each vertex colour and hint-vertcols will work. Are we sure this is the
as you have seen it already, if the normals are not set the second 
version won't work either. since the normals are undefined and they 
affect the colour of the face.

> I can see how we need normals for lighting but I'm not
> sure I understand why we need normals to set colours on objects. Do I
you don't need normals to set the colour, but lighting is on by default 
in fluxus, and because of this it will affect how coloured objects are 
rendered. try (hint-unlit) to turn off lighting and you won't need 
normals then.

> understand correctly that (colour) as it applies to objects is very
> different from setting the colour of all vertices to the same vector? This
it's not very different. you usually set vertex colours if you want to 
have different colours for each face, or want to display gradients 
between face vertices. they both set colour, the first one works on 
object level, while the second one on vertex level.

best,
gabor