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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> 
> 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] hotmailcom>
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] hotmailcom>
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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