> I want to ask how should I set the value of ambient and diffuse ?
> "pigment {color rgb spectral}" I only used the reflection of object . I do not
> need to consider the ambient and diffuse ,but I want to ask whether  need I to
> set the parameters of ambient and diffuse ?If need, "#default{ finish{ ambient
> 0.1 diffuse 0.9 }}"is OK?
>
>
>

For a purely refflective surface, ambient and diffuse are usualy set to 
zero. Most also set the diffuse and ambient lower for transparent textures.
A good starting diffuse value for a reflective object may be set as 
(when starting from the default diffuse and ambient values):
0.7*(1-reflection).
For ambient, you can try 0.1*(1-reflection).

A diffuse value of 0.9 is OK only for the brightest, extremely high 
albedo, objects. Normaly, the default of 0.7 is very good.




Alain

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