Warp <war### [at] tagpovrayorg> schrieb in im Newsbeitrag:
3c4c251a@news.povray.org...
>   I have noticed that heightfields sometimes present strange bugs which I
can't
> explain.
>   These bugs usually show up as small black areas in certain parts of the
> heightfield. These areas are not shadows (no_shadow as no effect on them)
> and they depend on the location of the camera (when the the heightfield is
> looked from a bit different location, the size of these black areas change
or
> they disappear).
>
>   Here is an example. Although you can see the bug and the effect of
moving
> the camera by rendering individual frames with different values of the
clock
> (between 0 and 1), it's best viewed as an animation (some of the black
areas
> slowly diminish in size and disappear). Also from the animation it's
clearly
> seen that they are not shadows.
>
>   Any idea what causes these bugs?
>
I think that the normals are switched because it goes away if you add
double_illuminate.


--
#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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