On 1 Dec 2001 17:16:59 -0500, Warp <war### [at] tagpovrayorg> wrote:
>  I have been experiencing strange and erratic problems with isosurfaces
> in beta 8, in both the Windows and Unix versions. The symptoms include
> POV-Ray crasing, going into an infinite loop or getting just black images
> (when there should be a visible isosurface).

POV 3.5 b 8 on PII 233 128 MB with NT 4 Sp 6
I can confirm. I have started sample animation i_internal.pov. It works fine but
I forgot to set png output. I stoped this and restarted with +FN and is stoped
at first frame with message

Scene contains 2 frame level objects; 0 infinite.
00:00:01 so far, rendering frame 1, going to 77.

File: C:\Program Files\POV-Ray for Windows v3.5\INCLUDE\functions.inc  Line: 16
Fatal Error: Floating-point exception detected in function 'f_algbr_cyl1'. Your
function either attempted a division by zero, used a function outside its domain
or called an internal function with invalid parameters.

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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