"SSSUTM" <nomail@nomail> wrote in message 
news:web.43608a3667789c1136a46a7d0@news.povray.org...
> Is it possible to apply bilinear filtering effect in Povray to make the
> scene more smooth.

Do you mean bilinear interpolation for in use on image_map pigments?
http://www.povray.org/documentation/view/3.6.1/337/
and http://www.povray.org/documentation/view/3.6.1/408/

Or could you mean smoothing edges in the entire scene?
There's antialiasing, which jitters and averages multisamples through pixels 
to reduce the stairstepping on edges: 
http://www.povray.org/documentation/view/3.6.1/223/

Cheers,
    Brian

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