Reference:Poly
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Higher order polynomial surfaces may be defined by the use of a poly shape.
The syntax is
POLY:
poly {
Order, <A1, A2, A3,... An>
[POLY_MODIFIERS...]
}
POLY_MODIFIERS:
sturm | OBJECT_MODIFIER
Poly default values:
sturm : off
Where Order is an integer number from 2 to 35 inclusively that specifies the order of the equation. A1, A2, ...An are float values for the coefficients of the equation. There are n such terms where n = ((Order+1)*(Order+2)*(Order+3))/6.
If additional accuracy is required you can add the sturm object modifier.