OK, what really dumb mistakes am I making?

#declare this_function =IC_Sphere(<0,0,0>, 1);

isosurface { function { this_function }
      contained_by { box { -2, 2} }
                        texture { pigment { color rgb <0.5, 0.5, 0> } }}

returns:

isosurface { function { this_function }


While

#declare this_function = IC_Sphere(<0,0,0>, 1);

isosurface { function { this_function(<0,0,0>,1) }
      contained_by { box { -2, 2} }
                        texture { pigment { color rgb <0.5, 0.5, 0> } }}

returns:

#declare this_function = IC_Sphere(<



So, leaving out the #declare statement entirely, and going it directly:

isosurface { function { IC_Sphere(<0,0,0>, 1)}
      contained_by { box { -2, 2} }
                        texture { pigment { color rgb <0.5, 0.5, 0> } }}


highlighting the first line of below:

function {
    f_sphere(x-Cx, y-Cy, z-Cz, _ICSG_Radius)

and returning the error message:





(I started with the IC_HF_Sphere function, but to make sure my problem
wasn't somehow with my image map, I simplified to the above, with the same
results.)

Normally, after several hours, I can fight my way through my obtuseness, but
not this time.

Please help.

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