Christoph Hormann wrote:

> Although your sample seems not very efficient, it should work quite ok,
> just use:
> 
>   method 1
> 
> or
> 
>   eval
> 
> or
>   max_gradient 20
> 
> as additional parameter in the isosurface.
> 
> By default megapov uses method 2 for predeclared functions and default
> max_gradient is 1 while 'eval' reveals max_gradient above 13 for your
> function.  For a simple geometric shape like yours 'method 1' is better
> anyway.
> 
> Christoph
> 

Thanks!  I'll have to do some reading up on method, eval, and max_gradient. 
 I tried all three of your suggestions - method and max_gradient 20 fixed 
the problem, but eval did not appear to change anything.  But it looks like 
I'm back in business :)

Ken

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