1.   is there a way to define a tuple-style argument to act as the x,y,z for the
function parameters?

Something like #declare _p = ???tuple-thing??? ;

#declare Result = FunctionQ (_p)


2.     With #declare F = function {spline ...........}
I have no problems using #declare I = function {F(FunctionQ(x,y,z)).x}
but when I try to use #declare I = function {F(FunctionQ(X,Y,Z)).x}
I get:
Parse Error: Expected 'parameter identifier or floating-point constant
identifier', } found instead

3. for spline functions, is there a syntax (or a work-around) that allows a
function to be used in the vector definition?

#declare FSpline = function {
 spline {
  linear_spline
    0, <0,   0,   FunctionW (x,y,z)>
                  .........
        }
}


Thanks

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