On 2015-07-18 04:30 AM (-4), LanuHum wrote:
> Picture shows results of Blender Internal Render and POV-Ray.
> I can achieve smoothing as in Internal or not?

For these renders, the brilliance was set to zero.  They verify that the 
light source is at a sufficiently steep angle to illuminate the entire 
blob, and confirm that the dark streak in the previous renders is not a 
shadow, but a simultaneous contrast effect produced by our brains.  (The 
eyedropper tool of an image editing program also confirms this, but is a 
bit clumsier to carry out.)

For the isosurface runs, the accuracy was changed to 0.00001 in order to 
reduce the isosurface artifacts.

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