Le 18-05-28 à 11:21, Kima a écrit :
> Following the suggestions made in
>
http://news.povray.org/povray.general/thread/%3Cweb.5b096a17747d6b9c3ce674f0%40news.povray.org%3E/
> 
> I tried to create a series of blur duplicates as the tail and came up with a
> code of like
> 
>   sphere{ <0,0,0>,0.27 pigment{rgb <1,0,0>}}
>   #declare Nr = 1;
>   #while (Nr>0)
> 
>   sphere{ <0,0,0>,0.27 pigment{rgbf <1,1,1,Nr>}
> 
>          hollow
>   interior{
>    media{
>     scattering{Nr,<1,1,1>}
>     //intervals 3
Never use ANYTHING but the default of 1 for intrvals !
>     samples 1,1
Increase this. You only get a single sample whitch is not enough.
The default is : samples 10.
Also, the second value is always silently discarted.
>     }
>   }
>           translate <Nr,0,0>
>         }
> 
>   #declare Nr = Nr - 0.1;
>   #end
> 
> It is getting close but far from a realistic motion blur. Any suggestion?
> 
> 

For media, the defaults are :
method 3
intervals 1
samples 10

confidence is NOT used
variance is NOT used
Only the first value of samples is ever used if you provide two.
Using intervals >1 greatly impaire your rendering speed.

Using intervals with a value larger than 1 is only adviseable if using 
method 1 or 2.

As your spheres overlap, you see the boundaries. It would be beter to 
use a single larger, and fully transparent, sphere and modulate the 
media density instead.

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