Am 21.12.2011 17:17, schrieb acasta:

> I expected to obtain the same result at this point, on the contrary I get a much
> darker image (so lighting must be substantially different) and also an array" of
> evenly spaced irregularly-shaped "blots" over the image.
>
> Could someone please explain what is happening?

Yup: Sky spheres can be thought of as having an "emission 1 ambient 0 
diffuse 0 specular 0 reflection 0" finish; note that this differs from 
the default finish for normal objects, which is primarily diffuse, so 
you'll have to specify these finish properties explicitly on your pseudo 
sky sphere.

As for the blots, they're most likely radiosity artifacts and will 
disappear once you set diffuse to 0.

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