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SamuelT. <STB### [at] aol com> wrote in message
news:38868E41.19938684@aol.com...
> Do you mean like being able to rotate functions? Such as: (x^8+y^8+z^8
> rotate y*45)
>
Being able to do general coordinate transformations would be a
very nice feature, but I think would require function{} accepting
vector-valued functions as additional parameters ( and the
attendant applying of the transforms)
For simple things like rotation about y you can get by with stuff like:
#declare F=function(x^8+y^8+z^8}
#declare A=pi/4;
#declare FRotated=function{cos(A)*x+sin(A)*z, y, -sin(A)*x+cos(A)*z}
That is, applying a matrix rotation 'by hand' to the coordinates.
Of course this is not a very satisfactory solution since composing
rotations gets very ugly very quickly.
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