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When running the following code, I get 2 spheres. I expected only one.
I use pov v3.1g on Windows98, P350, 128Mo.
A pov bug ? A windows bug? Is floating-point math that not precise ?
// ----------------------------------------
camera
{
location <0.0, 0.5, -4.0>
direction 1.5*z
right 4/3*x
look_at <0.0, 0.0, 0.0>
}
light_source
{
0*x
color White
translate <-30, 30, -30>
}
#if (cos(pi/2)>0)
sphere { 0.0, 1
pigment {Yellow}
translate x
}
#end
#if (cos(pi/2)=0)
sphere { 0.0, 1
pigment {Green}
translate -x
}
#end
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From: Thorsten Froehlich
Subject: Re: (cos(pi/2)>0) and (cos(pi/2)=0) are both true
Date: 26 Sep 2000 21:44:52
Message: <39d15114$1@news.povray.org>
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In article <39d13973$1@news.povray.org> , "Didier" <did### [at] cybercable fr>
wrote:
> Is floating-point math that not precise ?
You got the point.
Thorsten
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From: Warp
Subject: Re: (cos(pi/2)>0) and (cos(pi/2)=0) are both true
Date: 27 Sep 2000 07:08:19
Message: <39d1d511@news.povray.org>
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Thorsten Froehlich <tho### [at] trfde> wrote:
: You got the point.
Shouldn't the epsilon value be the same for = and for > thus making them
unique?
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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From: Thorsten Froehlich
Subject: Re: (cos(pi/2)>0) and (cos(pi/2)=0) are both true
Date: 27 Sep 2000 11:51:58
Message: <39d2179e$1@news.povray.org>
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In article <39d1d511@news.povray.org> , Warp <war### [at] tagpovrayorg> wrote:
> Shouldn't the epsilon value be the same for = and for > thus making them
> unique?
See "(X <= D) is not equal ((X<D) | (X=D))" in povray.bugreports.
Thorsten
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Thank you, I found a work around
#if ((cos(pi/2)>0) & (cos(pi/2)!=0))
sphere { 0.0, 1
pigment {Yellow}
translate x
}
#end
#if (cos(pi/2)=0)
sphere { 0.0, 1
pigment {Green}
translate -x
}
#end
39d2179e$1@news.povray.org...
> In article <39d1d511@news.povray.org> , Warp <war### [at] tagpovrayorg> wrote:
>
> > Shouldn't the epsilon value be the same for = and for > thus making
them
> > unique?
>
> See "(X <= D) is not equal ((X<D) | (X=D))" in povray.bugreports.
>
>
> Thorsten
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