I'm trying to create two macros for use with Iso-surfaces
they are

#macro mac_1()
    #if(abs(x)+abs(y)<=0.05)
          0
    #else
          1
    #end
#end

#macro mac_2(a,b,c)
   abs(a)+abs(b)
#end


they are called from the isosurface as

isosurface{
function{ mac_1() }

}

isosurface{
function { mac_2(x,y,z) }
}

both produce 'float expected vector identifier found instead' errors.

anybody got any ideas

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