Ron Parker wrote:
> 
> >More precisely : the resulting finish value of one point of an object
> >changes with the point of view. (while the pigment and normal don't)
> 
> Normal certainly does, at least as much as finish does.  The terminology is
> a bit sloppy, though.

Normal does ??

let's say :

 sphere {<0,0,0>,1 pigment {Red} 
                   normal {bumps .1} 
                   finish {reflection .5}
        }

let's consider the surface of the sphere at <0,1,0> (top of it).

The pigment value returned for that point will be the same,
whatever the camera position is.

The "virtual" slope (normal perturbation) at that point will
always be the same, regardless of the camera position.

However, the finish value returned (coming from reflection,
in that example) will be different with a different camera.

Fabien.

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