> different surface to that generated by the function outside of the 
pattern.
 >
 > #declare fn_myripples = function { // This doesn't work as expected
 >    pattern {
 >      function {cos(sqrt(x*x + z*z)*5*pi)*0.08}
 >    }
 > }

I believe patterns evaluate the function and then wrap the resulting 
value to the range [0,1). Since cos() returns negative numbers 
sometimes, they're getting wrapped around to higher values (for 
instance, -.3 becomes .7).

  - Slime

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