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Could somebody provide me with a function (preferably in a no-brainer macro form
:) that gives concentric cones? I want to use it in a pigment...
Thanks
Margus
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On Wed, 17 Nov 1999 02:09:40 +0200, Margus Ramst <mar### [at] peak eduee>
wrote:
>Could somebody provide me with a function (preferably in a no-brainer macro form
>:) that gives concentric cones? I want to use it in a pigment...
>Thanks
>
>Margus
Concetric in what manner? Sharing a common vertex and concentric in
terms of angle, or sharing a common angle and concentric in terms of
vertex and base?
Peter Popov
ICQ: 15002700
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The latter.
Margus
Peter Popov wrote:
>
> Concetric in what manner? Sharing a common vertex and concentric in
> terms of angle, or sharing a common angle and concentric in terms of
> vertex and base?
>
> Peter Popov
> ICQ: 15002700
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Still not sure to fully understand what you need, but would something like
this work ?
(To be used with the superpatch of course)
camera{location -z*10 look_at 0}
plane{ z,0
texture {pigment {crackle form x frequency 3
color_map{[0 color <1,0,0>][0.25 color <1,1,0>][0.5 color rgb
0][0.75 color <0,0,1>][1 color <0,1,0>]} }
finish{ambient 1 diffuse 0}
}
}
G.
Margus Ramst wrote:
> The latter.
>
> Margus
>
> Peter Popov wrote:
> >
> > Concetric in what manner? Sharing a common vertex and concentric in
> > terms of angle, or sharing a common angle and concentric in terms of
> > vertex and base?
> >
> > Peter Popov
> > ICQ: 15002700
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I wrote,
>> Concetric in what manner? Sharing a common vertex and concentric in
>> terms of angle, or sharing a common angle and concentric in terms of
>> vertex and base?
And on Wed, 17 Nov 1999 12:59:31 +0200, you wrote:
>The latter.
>
>Margus
So, what parameters will you need? Vertex1, Vertex2 (vectors), Radius1
and Radius2 (floats), right? Maybe just Radius1 and Radius2, with
vertices 1 and 2 being <0,0,0> and <0,1,0> resp. I will think about
that.
Peter Popov
ICQ: 15002700
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Hmm... No.
I mean something like the wood pattern, which is basically concentric cylinders.
Imagine a stack of cones, all having the same XZ axis and vertex angle, but each
uniformly scaled larger than than the previous one. This is basically how real
woodgrain is structured.
I hope this explains what I need...
Margus
Gilles Tran wrote:
>
> Still not sure to fully understand what you need, but would something like
> this work ?
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I would imagine that none of this is necessary, really. Preferably, this should
be an infinitely looping pattern, with the tip of the cones tapering to a point,
and the cones themselves extending into infinity. The vertex angle might make
things more convenient, but everythig can be adjusted by scaling.
I re-iterate, I would use this function for a pattern, not some finite object.
Margus
Peter Popov wrote:
>
> I wrote,
> >> Concetric in what manner? Sharing a common vertex and concentric in
> >> terms of angle, or sharing a common angle and concentric in terms of
> >> vertex and base?
>
> And on Wed, 17 Nov 1999 12:59:31 +0200, you wrote:
>
> >The latter.
> >
> >Margus
>
> So, what parameters will you need? Vertex1, Vertex2 (vectors), Radius1
> and Radius2 (floats), right? Maybe just Radius1 and Radius2, with
> vertices 1 and 2 being <0,0,0> and <0,1,0> resp. I will think about
> that.
>
> Peter Popov
> ICQ: 15002700
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What I still have trouble figuring out is the kind of pattern you expect to see when
applied to an object, and how it would be different from regular wood, or onion, or
even spherical. Perhaps you could hand-draw something and post it in binaries ???
G.
Margus Ramst wrote:
> Hmm... No.
> I mean something like the wood pattern, which is basically concentric cylinders.
> Imagine a stack of cones, all having the same XZ axis and vertex angle, but each
> uniformly scaled larger than than the previous one. This is basically how real
> woodgrain is structured.
> I hope this explains what I need...
>
> Margus
>
> Gilles Tran wrote:
> >
> > Still not sure to fully understand what you need, but would something like
> > this work ?
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After _LOTS_ of thinking I got a really short answer:
Given an aperture angle 'Angle' for the cone and a point 'p' in space,
the color for that point is:
-sin(Angle)*abs(p.x)+cos(Angle)*vlength(<p.y,p.z>)
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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(Of course if you need a value between 0 and 1 you have to clamp the value
returned by that function; I don't know how isosurface functions work but
I suppose that they do the clamping by themselves when calculating
pigments.)
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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