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Question: plottools transform argument missing

Question:plottools transform argument missing

pgr 10 Maple 13
plottools transform argument
May 29 2012
1

i am successfully transforming a 2D plot, when doing the exact analog thing to a 3D plot i get the error message 

Error, (in t) invalid input: unknown uses a 3rd argument, z, which is missing

 

i have no idea what's going on, please advise.

 

i made a minimum example:

this works:

> restart:with(plots):with(plottools):
> norm2:=x->x[1]^2+x[2]^2:
> N:=[0,1]:
> phi:=(x,y)->N+2*([x,y]-N)/norm2([x,y]-N):
> t:=transform(phi):
> p:=plot(0,-1..1):
> t(p);
 
this doesnt: 
> restart:with(plots):with(plottools):
> norm2:=x->x[1]^2+x[2]^2+x[3]^2:
> N:=[0,0,1]:
> phi:=(x,y,z)->N+2*([x,y,z]-N)/norm2([x,y,z]-N):
> t:=transform(phi):
> p:=plot3d(0,-1..1,-1..1):
> t(p);
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