On 04/10/2018 11:53 AM, clipka wrote:
> Am 10.04.2018 um 14:01 schrieb IGM:
>> I obtained a quite good result (for my needs), but I still cannot notice any
>> difference in using "albedo"...
> 
> `albedo` makes a difference when you set `brilliance` to anything other
> than the default of 1.0.
> 

This note exists in our documentation only where diffuse albedo is 
specified - and I missed it. I was too confused about little or no 
effect when I tried it. I'm remain foggy on the albedo workings.

- Does the "only works with brilliance != 1.0" not apply to phong and 
specular albedo too... Or does it and we don't mention it in our 
documentation?

- I've never used 'diffuse albedo' without 'phong albedo' or 'specular 
albedo' being specified too as I thought the point was to consider the 
contributions together and further that diffuse albedo would be 1.0 and 
phong albedo + specular albedo also = 1.0. I see in Igmar's code he has 
specular 0.0 so not having the albedo qualifier there likely no issue. 
If his specular value were to have been other than 1.0 what would 
happen? Might suppose the diffuse calculation would still consider the 
specular but would the specular calculation consider the diffuse albedo 
value?

- What happens in the reverse if someone specifies plain diffuse but 
phong/specular albedo values ?

- We have only two sample scenes using albedo. The first your torus2.pov 
and only in the default {} with brilliance unchanged. The other 
finish_fresnel.pov where the the diffuse/specular values match as I 
expect, but where brilliance is not specified. Should brilliance at 
other than 1.0 be added in that scene?

Aside: A sample scene showing an albedo set up versus not with visible 
differences would probably be a help.

Bill P.

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