Marc-Hendrik Bremer wrote:

> What am I doing wrong?

The rotation is wrong (your hf is pointing downwards) and the base function
should be y instead of z.
Try this instead :
#declare HundFN=function{pigment{image_map{png "Hund-Hf.png"}rotate x*90}}
isosurface {
     function { y - 0.5*HundFN(x,y,z)}
     contained_by{box {0,1}}
     pigment{rgb 1}
     translate <-0.5,0,-0.5>
     scale <3,1,3>
}

G.


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