> isosurface {
>         function { f_sphere(x, y, z, 1.6)-fn_Pigm(x/2, y/2, z/2).gray*0.5 }
>         pigment { color <255,225,32>/255}
>         rotate y*-30
> }
> //------------------------------<<iso_map.pov

I don't see a bounded_by statement in there.  Maybe if your the default
bounding box is something like box { 1, -1 } then it would certainly cut
off most of your 1.6 radius sphere.

Try inserting this statement right beneath function{...}:

bounded_by { box { 2, -2 } }


That should make the bounding box plenty big enough for your sphere.  At
least, if that IS the problem.

Budge

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