On 2/18/2018 7:00 AM, clipka wrote:
> Am 17.02.2018 um 21:28 schrieb Mike Horvath:
>> I posted five images to Flickr showing my experiments with blurred
>> reflections.
>>
>>
https://www.eurobricks.com/forum/index.php?/forums/topic/159291-pov-ray-surface-realism/
>>
>>
>> I asked on Eurobricks which is the most realistic image? I will also ask
>> here. Which do you think look the most like real LEGO bricks?
> 
> I find it difficult to judge, as I'm not used to such large LEGO models.
> I'd consider a closeup helpful.
> 
> Another tip you may or may not already be aware of: For best realism,
> make sure to use a modern (v3.7.1/v3.8.0) version of POV-Ray, and make
> use of the finish-level `fresnel` statement, e.g.:
> 
>      #declare MyLegoMaterial = material {
>        interior { ior 1.6 }
>        texture {
>          pigment { ... }
>          finish {
>            ambient 0
>            diffuse albedo DIFF
>            specular albedo SPEC roughness ROUGH
>            fresnel on
>            reflection { SPEC fresnel on }
>            conserve_energy on
>          }
>          normal { ... }
>        }
>      }
> 
> Presuming you're using normal-based blurred reflections, DIFF and SPEC
> should probably be exactly 1.0 each(!), and ROUGH should be very low
> (e.g. 0.0001).
> 
> Setting the finish-level `fresnel` parameter to `on` causes both the
> diffuse component and specular highlights to vary with the viewing angle
> in a realistic manner, making specular highlights more pronounced at
> shallow angles (just like reflection-level `fresnel on` does for
> specular reflection), while reducing the diffuse component's brightness
> accordingly (just like `conserve_energy` does for transmitted light).
> 


Thanks for the tip. However, I changed the finish to this:



#local ldrawPlasticFin=finish {
  ambient			0
  diffuse albedo		1
  specular albedo	1
  roughness			0.0001
  fresnel			on
  reflection {1 fresnel on}
  conserve_energy
};



Now I see no reflections at all on the bricks.


Mike

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