The following gives a "bad operand for period operator" error.
If it is SPL(clock).x there is no problem, with .z there is.
#declare SPL= spline{
cubic_spline
0 , 1
0.5, 1.5
1 , 2
}
sphere { <0,0,0>
SPL(clock).y
pigment {rgb 1}
}
Ingo
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