"Hugo" <hua### [at] post3teledk> wrote..
>My prior post was "isosurfaces in v3.5 and how to convert them to
>heightfields" and there I mentioned that isosurfaces were slower in Pov3.5
>due to the lack of "method 1"... Here is the proof, and I humbly ask the
>great people developing Pov to take another look at this and eventually
>explain why method 1 was removed from Pov 3.5.

"Method 2" is valid for any continuous functions (if you use appropriate
max_gradient and accuracy values) while "method 1" is not.
This is the major problem of "method 1".

>MegaPOV 0.7:
> Method 2 = 11 secs
> Method 1 =  2 secs
>
>POV 3.5 beta 5:
> Method 2 = 13 secs

As discussed in p.b.i,
http://news.povray.org/povray.binaries.images/18925/?ttop=19235&toff=50&mtop
=123788&moff=10
optimization of the function gives us much faster rendering speed
in some cases.

Try following code.

R. Suzuki

//  ----- The code
#version 3.5;
#include "functions.inc"

camera { right -1.33*x up 1*y direction 1*z location <-3,0,6>
look_at 0 angle 48 }
light_source { <-25,25,35> color rgb 1.5 }

isosurface { function {
     min(
       sqrt((x-.5)*(x-.5)+y*y+z*z
         + .001^((x+.5)*(x+.5)+y*y+z*z-0.75)
         - .0001^abs((y+.2)*(y+.2)))-1,
       f_r(x*0.55,y,z*0.7)*0.35
       )
 }

     max_gradient 3.2 //278.219
     accuracy .008
     contained_by { box { <-1,-1,-1.5>,<1.25,1,1.5> } }
     pigment { rgb 1 } finish { ambient 0 diffuse .67 specular .1 }
no_shadow }

//  ----- End

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