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Here is sample image of iso_sphere_sweep
Currently it is designed for linear sphere sweep with constant radius.
I'm working on float radius just like "traditional" linear sphere_sweep works.
Render time 11 min on P4 900 MHz iirc.
ABX
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Attachments:
Download 'test.png' (63 KB)
Preview of image 'test.png'
![test.png](/povray.binaries.images/attachment/%3Cb6093uceia9d225oi3q92u48o4kcrmg49q%404ax.com%3E/test.png?preview=1)
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>
> Here is sample image of iso_sphere_sweep
> Currently it is designed for linear sphere sweep with constant radius.
> I'm working on float radius just like "traditional" linear sphere_sweep works.
> Render time 11 min on P4 900 MHz iirc.
Wlodek, I too have been working on such a iso sphere
sweep feature as you describe here.
I don't know if you ever saw these two pictures
that I posted to this group earlier: (?)
"Iso-sombrero" (22. Nov. 2000)
http://news.povray.org/povray.binaries.images/13218/
news://news.povray.org/3A1BC496.F202B75C%40online.no
and:
"Outside It" (29. Jan 2001)
http://news.povray.org/povray.binaries.images/13533/
news://news.povray.org/3A75E2D9.BCDC99AE%40online.no
Both contains a kind of "iso-sphere-sweeps" and
both were made with Mega-POV.
But the "sweeps" within these images are not made
with parametric functions, as some other iso-sphere
sweeps I have seen in here. E.g. by Mike Williams.
He has even made web pages about this:
http://www.econym.demon.co.uk/isotut/splines.htm
I hope this helps.
Tor Olav
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On Thu, 03 Jan 2002 23:36:31 +0100, Tor Olav Kristensen <tor### [at] hotmail com>
wrote:
> Wlodek
: )
> I too have been working on such a iso sphere
> sweep feature as you describe here.
> I don't know if you ever saw these two pictures
> that I posted to this group earlier: (?)
I saw, I just forgot them.
> "Iso-sombrero" (22. Nov. 2000)
> "Outside It" (29. Jan 2001)
To find differences. I've designed macro to work this way:
#local APoint=array[5]{
<1,2,3>
<5,6,7>
<1,5,0>
<2,6,8>
<1,2,3>
}
#local ARadius=array[5]{
4
2
3
1
4
}
f_sphere_sweep( APoint, ARadius )
And as result of f_sphere_sweep() macro I've ready function of this linear
sphere_sweep and I can add some transformations, combinations and noises.
> Both contains a kind of "iso-sphere-sweeps"
So they are designed only for one equation and not serve general method for part
of sphere_sweeps ?
> I hope this helps.
Without your sources not :-)
ABX
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>...
> f_sphere_sweep( APoint, ARadius )
>
> And as result of f_sphere_sweep() macro I've ready function of this linear
> sphere_sweep and I can add some transformations, combinations and noises.
I think I understand what you are up to.
Are you planning for non-linear sweeps
between the points as well ?
E.g. cubic splines ?
> > Both contains a kind of "iso-sphere-sweeps"
>
> So they are designed only for one equation and not serve general method for part
> of sphere_sweeps ?
Yes, that is true so far.
I.e.: You will have to provide an equation
that the iso sphere sweep can "follow".
> > I hope this helps.
>
> Without your sources not :-)
OK, I'll clean up, simplify, re-write and
post the source code for use in v3.5.
(But not now, because I'm very tired now.)
Tor Olav
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On Sat, 05 Jan 2002 04:48:33 +0100, Tor Olav Kristensen <tor### [at] hotmail com>
wrote:
> Are you planning for non-linear sweeps
> between the points as well ?
> E.g. cubic splines ?
Perhaps, I will try noise on linear coordinates first.
> > Without your sources not :-)
>
> OK, I'll clean up, simplify, re-write and
> post the source code for use in v3.5.
I'm looking forward
> (But not now, because I'm very tired now.)
Me too
ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)&_((x+y)*.7,z,.1)&_((x+y+2)*.7,z,.1)&_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35
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