William F Pokorny <ano### [at] anonymousorg> wrote:

>
> If measuring other than some single image center point for itensity - if
> measuring all the values in a complete image - I'd start with a point
> light at the origin around which I'd place a hollow sphere with an
> inside texture having a white pigment and finish {diffuse 1.0 ambient 0.0}.
>

If using v3.7xx, the finish should be  {diffuse 1.0 ambient 0.0 emission 0.0}--
because emission also has a default, I believe (of 0.1?), although I can't
recall where I saw that in the documentation.

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