Has anyone ever tried to do the following?

sphere_sweep {
        cubic_spline
             4 , // Num_of_spheres
             #if (clock > 0.25) < 50 , 50 , 50 >, 8 #end
             #if (clock > 0.5) < 50 , 60 , 50 >, 8 #end
             #if (clock > 0.75) < 50 , 50 , 90 >, 8 #end
             #if (clock > 0.9) < 50 , 40 , 50 >, 8 #end
             texture {
               pigment { color Red }
               }
        }

I keep getting an error where povray expects a number expression and finds
the texture { instead. I think its related to the number of spheres
changing dynamically with the clock? Any suggestions? I would really prefer
to use a sphere sweep.

As always, much thanks!

-mike

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