Hello,
I wrote a macro to build a mesh from mathematic formulas. Is it
possible to delete some triangles from tihs mesh, i.e. to cut a hole
in the generatet surface?

Greetings,
  Johannes

-- 
#macro q(s)(s*s)#end union{#declare C=-1;#while(C<1)sphere{<512*(11*C-9)/q(121*C
*C-198*C+97)-4,4.22*(3-11*C)/(exp(C*11/4)+2.12)+11*C-8.5,20>.3}sphere{<4-.15*exp
(3.3*C),12/5-11*C/2,20>.3}sphere{4*<1-4*(q(C*C)-C*C),C+7/8,5>.3}sphere{<2*C-6,
7.5,20>.3}#declare C=C+.01;#end pigment{color x}}light_source{-4*x 1}

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