Hi,

I got an annoying "black pixel" problem, which was mentioned here several times
before.

When I added a "carpet"-like normal to a plane, I got black pixels on nonrelated
objects.

Here is the offending normal part:
normal {
        average
        normal_map {
              [1      quilted 3
                      control0 0.5
                      control1 0.9
                      scale 0.24
                      turbulence 1
              ]
              [1      bumps 0.9
                      warp {turbulence 1}
                      scale 2
              ]
              [1      bumps 0.6
                      warp {turbulence 0.5}
                      scale 0.01
              ]
        }
        scale 0.05
}

I found a circuitous solution by saving radiosity data, rendering with no_image
on the plane and +ua, rendering a mask (because of an mistake in the sky_sphere
definition this part wasn't fully transparent) and finally combining all of it
to a defect-free final render (via povray).

The result can be seen on the current TinaChep round "Abstract"
(http://www.tc-rtc.co.uk/display/animation.html).

Now the question - is there a more elegant solution for the problem or is the
reason known causing the black pixels?

Norbert Kern

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