Here is a very small scene which shows some odd artifacts. There should 
be no coincident surfaces here - or is there? You can see surprisingly 
more artifacts by removing the double slash before the second box. What 
causes these and how can I get rid of them?

You can see the artifacts in the shadow of the superellipsoid.


light_source { <0,2,2> 1}

camera {
     location <0, 0.1, -0.5 >
}

union {
     box {<-0.25,-0.02,-0.25>,<0.25,0.0,0.25>}
     // box {<1,1,1>,<2,2,2>}

     superellipsoid { <0.4,0.4>
                       scale <0.22,0.015,0.22>
                       }
     pigment{ rgb 1}
}

Severi Salminen

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