I was checking max gradient of an isosuface in order to speed up rendering.
my code is:

        #declare Tentacule = isosurface {
        //        function { TentaFct(x*(1+0.006*(6-y)*sin(12*atan2(z,x))),
select(y,0.75*y,y), z*(1+0.006*(6-y)*sin(12*atan2(z,x))) ) }
                function { TentaFct( x , y , z ) }
                        max_gradient 2
                        evaluate 2 1.05 0.95
                        contained_by {
                                box {<5.5,-0.3,5.5>,<-5.5,-15,-5.5>}
                        }
        #if (Finish > 0)
                hollow
                interior { ITent }
        #end
                texture { TTent }
        }

And the result in message window is

    Warning: Evaluate found a maximum gradient of 2.000 and an average
    gradient of 2.000. The maximum gradient variation was 0.000.

    It is recommended to adjust the parameters of 'evaluate' to:
    First parameter less than 2.000
    Second parameter less than 1.000 and greater than 1.0
    Third parameter greater than 1.000 and less than 1.0

What does it mean?

Chaps

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