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From: Tom Melly
Subject: Help clarification for pigment functions in isos
Date: 13 Sep 2001 10:59:04
Message: <3ba0c9b8@news.povray.org>
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6.5.4.2 Functions in Isosurface
#declare FBozo = function { pigment { bozo color_map { [0 rgb 0] [1 rgb 1] }}}
isosurface {
function { FBozo(x,y,z).gray }
...
}
Although correct, wouldn't this be better as:
#declare FBozo = function { pigment { bozo color_map { [0 rgb 0] [1 rgb 1] }}}
isosurface {
function {y - FBozo(x,0,z).gray }
...
}
or similiar?
--
#macro G(D,E,F)#local I=array[3]{D,E,F}#local B=0;triangle{#while(
B<3)#while(I[B])A[mod(I[B],10)]+#local I[B]=div(I[B],10);#end<-5,-
2,9>#local B=B+1;#end}#end #local A=array[7]{x,x*2,x*4,y,y*2,y*4,z
}light_source{-x*6-z*9,1}mesh{G(105,10,146)G(105,246,10)G(105,56,
146)G(105,1256,246)G(1256,126,220)G(22156,2216,201)pigment{rgb 1}}//TM
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in news:3ba0c9b8@news.povray.org Tom Melly wrote:
> Although correct, wouldn't this be better as:
> [...]
> function {y - FBozo(x,0,z).gray }
>
Why?
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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From: Tom Melly
Subject: Re: Help clarification for pigment functions in isos
Date: 13 Sep 2001 12:14:38
Message: <3ba0db6e$1@news.povray.org>
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"ingo" <ing### [at] home nl> wrote in message
news:Xns### [at] povrayorg...
> in news:3ba0c9b8@news.povray.org Tom Melly wrote:
>
> > Although correct, wouldn't this be better as:
> > [...]
> > function {y - FBozo(x,0,z).gray }
> >
>
> Why?
>
Because, and I may be doing something stupid, the following does not actually
render anything as far as I can see...
#declare fn_floor= function{pigment{bozo color_map{[0 rgb 0][1 rgb 1]}}}
isosurface {
function {fn_floor(x,y,z).gray}
max_gradient 7
contained_by {box{<-10,-10,-10>,<10,10,10>}}
accuracy 0.1
evaluate 1, 1.2, 0.99
pigment{rgb 1}
finish{ambient 1}
}
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Wasn't it Tom Melly who wrote:
>"ingo" <ing### [at] homenl> wrote in message
>news:Xns### [at] povrayorg...
>> in news:3ba0c9b8@news.povray.org Tom Melly wrote:
>>
>> > Although correct, wouldn't this be better as:
>> > [...]
>> > function {y - FBozo(x,0,z).gray }
>> >
>>
>> Why?
>>
>
>Because, and I may be doing something stupid, the following does not actually
>render anything as far as I can see...
>
>#declare fn_floor= function{pigment{bozo color_map{[0 rgb 0][1 rgb 1]}}}
>isosurface {
> function {fn_floor(x,y,z).gray}
> max_gradient 7
> contained_by {box{<-10,-10,-10>,<10,10,10>}}
> accuracy 0.1
> evaluate 1, 1.2, 0.99
> pigment{rgb 1}
> finish{ambient 1}
>
>}
Because, of course, the specified pigment takes values that are greater
than zero everywhere (using the new default noise_generator settings -
bozo using the old noise algorithm had plateaus at zero) and the default
threshold is zero. The surface only exists at points where the function
is equal to the threshold, and that doesn't happen.
An alternative fix would be to specify something like "threshold 0.5",
but that's a bit of a boring surface.
--
Mike Williams
Gentleman of Leisure
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From: Tom Melly
Subject: Re: Help clarification for pigment functions in isos
Date: 14 Sep 2001 04:21:38
Message: <3ba1be12@news.povray.org>
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"Mike Williams" <mik### [at] nospamplease> wrote in message
news:Bdv### [at] econymdemoncouk...
>
> Because, of course, the specified pigment takes values that are greater
> than zero everywhere (using the new default noise_generator settings -
> bozo using the old noise algorithm had plateaus at zero) and the default
> threshold is zero. The surface only exists at points where the function
> is equal to the threshold, and that doesn't happen.
>
Aha/Doh!
> An alternative fix would be to specify something like "threshold 0.5",
> but that's a bit of a boring surface.
>
Boring I can live with, visible would be nice... what about
#declare fn_floor= function{pigment{bozo color_map{[0 rgb 0][1 rgb 1]}}}
isosurface {function {fn_floor(x,y,z).gray - 0.1}
... which would avoid upsetting any threshold purists...
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