> But it seems that one of the texture (the first texture) disappears, or at least
> is not put on the first point. Instead, the second texture is on the first point
> and the third texture is used on the second and third points.

Probably parser made layered texture from first and second. But then should
report wrong number of textures IMO.

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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