Le 2026-05-26 à 13:28, Cossack a écrit :
> Hello, I have a question: how to make a blurred reflection in Povray version
> 3.7?

Work with versions 3.3+.
Two ways :
1) Micro-normals. Use some normal, like granite, scaled very small. Need 
to use antialiasing to work.
2) Averaged normals. Apply many normals randomly displaced. Really slow 
down the render. You must avoid inter reflections between surfaces with 
blurred refection. Use no_image and no_reflection this way : One object 
with the averaged normals and the no_reflection attribute. Don't show in 
reflections.
A second identical object with micro-normals or just normal reflection 
instead of the averaged normals, and the no_image attribute. Not visible 
directly, but shows in reflections.

Micro-normals work best with some averaging. Normally, 5 to 10 instances 
are OK.
Averaged normals usually demand 200+ instances.

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With version 3.8 and radiosity, you can get blurred metallic reflection 
using brilliance.
Need to add «brilliance on» in the radiosity block.
Need the surface to have a pretty high brilliance. Typically 100 to 1000.
This blurring seems to be similar to phong highlights : Higher value = 
more and sharper reflection.

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