Well, looking at the Intermediate Isosurface tutorial (good stuff), I was
able to narrow down the problem (or what I think is a problem) with
rendering isosurface spheres with MegaPOV (see my earlier post) to the
rendering method (1 or 2) that was used.  It seems that using a declared
function in a isosurface, which I learned from the aforementioned tutorial,
causes the rendering method 2 to be used by default.  (Is this in the
MegaPOV doc's?  I guess I should read them thoroughly instead of picking out
bits and pieces)  And method 2 does not like the function x*x+y*y+z*z for
whatever reason.  I am listing the source code below for a couple of
spheres, differing by rendering method 1 or 2 alone below--> the method 2
sphere does not appear.  Needless to say, I will be using method 1
exclusively for the time being.  Hope this info will help,

Quadhall
tre### [at] ww-interlinknet

P.S.  Isosurfaces still rule!
P.P.S.  The programmers who brought us POV and MegaPOV rule even more!

the code:

#version unofficial MegaPOV 0.5;
light_source { <3,5,-8> 1 shadowless}
camera{ location  <0,0,-4> look_at   <0,0,0> }

#declare a = function { x*x+y*y+z*z }

isosurface
{
 function {a(x,y,z)}
 contained_by{sphere {0,4}}
 threshold 1
 method 1
 eval
 pigment{color rgb 1}
 translate <-1,0,0>
}

isosurface
{
 function {a(x,y,z)}
 contained_by{sphere {0,4}}
 threshold 1
 method 2
 eval
 pigment{color rgb 1}
 translate <1,0,0>
}

Post a reply to this message