Here is big isosurface with my maze3d function. mapped version (with
checker pattern) was designed with megapov .7 and it is during
translation to pov 3.5 as not mapped version shows. I just love this
function/iso possibilities.

ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35

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Preview of image 'maze.jpg'

Preview of image 'uv-maze.jpg'