Your rec() macro never generates an opening "{", so calling "rec(n-1) }" is
meaningless. I'd suggest that you stop confusing yourself and close your
braces in the same macro you open them in.

The reason for the error message in case I) is that the first few lines of
POV that your code generates are:

blob{   threshold 0.5 sphere {0,0.5,1
}
}
sphere {0,0.5, 1
}
[...]

So POV gives the right error message.

Anders

--
light_source{6#local D=#macro B(E)#macro A(D)#declare E=(E-#declare
C=mod(E D);C)/D;C#end#while(E)#if(A(8)=7)#declare D=D+2.8;#else#if(
C>2)}torus{1..2clipped_by{box{-2y}}rotate<1 0C>*90translate<D+1A(2)
*2+1#else}cylinder{0(C-v=1).2translate<D+C*A(2)A(4)#end-2 13>finish
{specular 1}pigment{rgb x}#end#end#end-8;1B(445000298)B(519053970)B
(483402386)B(1445571258)B(77778740)B(541684549)B(42677491)B(70)}

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