POV-Ray : Newsgroups : povray.binaries.images : Nested spherical isosurface(s) Server Time: 27 Jun 2019 03:59:13 GMT
  Nested spherical isosurface(s) (Message 1 to 2 of 2)  
From: Bald Eagle
Subject: Nested spherical isosurface(s)
Date: 6 Jun 2019 02:00:01
Message: <web.5cf87347b862aab64eec112d0@news.povray.org>
Researching the answers to questions [re]exposes me to information and
techniques and old projects.
That plants the seed.
Then, like a true POV-Ray addict, the brain cannot go to sleep, and insists on
suggesting that an isosurface can create "multiple objects" and that those
objects could be concentric spheres.
Even better - patterned concentric spheres.
Colored by distance from the origin.

So here's a little doodle inspired by PM2Ring and Mike Williams, the "no image"
project for jr (with much valuable input from Bill Pokorny) using HSV functions
I adapted from the colors.inc RGB2HSV macro for use with media.

As a further development, I figured each shell could be a different function,
using select().
Suggestions for how exactly to go about that would be GREAT ;)
But since some functions may be inherently spherical, and others will need some
heavy massaging to use f_ph, f_r and f_th to wrap them around in spherical
coordinates, I will leave that for a later time.


Other isosurface addicts welcome to contribute fun functions!  :D


Notes:

The texture is an onion pattern with a spline-interpolated HSV color map.
I can't recall if there was a direct way to color isosurfaces based on <x, y, z>
coordinates and I'm terrible at searching for even my own past work.  :|

This took 16 seconds, using the evaluate trick.


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Attachments:
Download 'hsvmeshspheres.png' (132 KB)

Preview of image 'hsvmeshspheres.png'
hsvmeshspheres.png


 

From: jr
Subject: Re: Nested spherical isosurface(s)
Date: 6 Jun 2019 21:30:00
Message: <web.5cf984d9acda6321a2aab1e70@news.povray.org>
hi BW,

"Bald Eagle" <cre### [at] netscapenet> wrote:
> Then, like a true POV-Ray addict, the brain cannot go to sleep, ...

that, and the coffee..  ;-)

I probably would not know an isosurface if it bit me, but :-)  if those
(half)spheres revolved slowly, each along a different axis while staying
concentric, it'd make a real nice animation.


regards, jr.


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