the following scene

#include "math.inc"
#declare r=1;
#declare d=0.1;
#declare ridges=24;
isosurface{
   function{ sqrt(x*x+y*y)-r - (cos(atan(y/x)*ridges)*d) }
   threshold 0
   max_gradient 2
   contained_by {box{<-1,-1,0>, <1,1,1>}}
   texture{pigment{color rgb 1 transmit 0.5}}
}

gives the following error

File: C:\Data\3D\bumpycyl.inc  Line: 5
Fatal Error: Floating-point exception detected in function ''. Your 
function either attempted a division by zero, used a function outside 
its domain or called an internal function with invalid parameters.

but only if antialiasing is turned on, and then not at all camera angles.

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

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