POV-Ray: Newsgroups: povray.beta-test: Heightfield bug (most probably an inverted normals problem): Re: More info (Was: Heightfield bug (most probably an inverted normals problem))

POV-Ray : Newsgroups : povray.beta-test : Heightfield bug (most probably an inverted normals problem) : Re: More info (Was: Heightfield bug (most probably an inverted normals problem))		Server Time 18 May 2024 18:28:52 EDT (-0400)

From: Simon Adameit
Date: 23 Jan 2002 08:15:11
Message: <3c4eb75f@news.povray.org>

>   It's not actually a heightfield bug. It's a more general phenomenon. If
the
> angle between the normal vector returned by the object (any object) and
the
> incoming ray is <90 degrees, then the normal vector is inverted.

Imho these bugs can only appear if the normal is somehow modified.
Wouldn't it be possible to just test the unmodified normal?

--
#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

Post a reply to this message