>
>   Any idea what causes these bugs?

Try this and you will see that the normals indeed seem to be switched.

camera
{ location #if(0) <0,-0.3,0> #else 0 #end
  look_at z*1
}

height_field
{ function 200,200 { pattern { granite } }
  smooth
  scale <10,1.5,10>
  pigment {slope y}
  finish{ambient 1}
  translate -<5,.3,0>
}


--
#local T=text{ttf"timrom.ttf""Simon Adameit".01,0}#local Y=1;#while(Y>-1)
#local X=0;#while(X<7)#local O=trace(T<X,Y><X,Y>+z);cylinder{<X-3,Y,5>*.01
<X-3,Y,5>*.01+5e-3,5e-5pigment{rgb 25*O}}#debug chr(83-(O.x=0)*51)#local
X=X+.05;#end#debug"\n"#local Y=Y-.05;#end

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