I am having problems with the following pattern:

pigment
{
 function {sqrt(pow(x,2) + pow(z,2)) / cos(asin(abs(y)))}
 pigment_map
 {
  [0 color rgb 0]
  [1 color rgb <0,1,0,>]
 }
}

POV-Ray gives the following error:

"Parse 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."

Could somebody please explaing to me why this is and what I can do to fix it?

-Mike

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