>>The following does not work for negative b:
>>ArchimedeanSpiral:
>>_FxGraph3D a*pow(v,(1/b))*cos(v)/PI;c*pow(v,(1/b))*sin(v)/PI;0;0;1;0;6.283185307179586;0;50;6;1;6;U

Hi Brian

it works, but your settings is not correct.
For example, v=0, b=-2
pow(v,(1/b))*sin(v) = pow(0,-0.5)*sin(0) = infinity * sin(0) = infinity * 0 = indeterminate => math error

to avoid this use minV=0.0001
_FxGraph3D a*pow(v,(1/b))*cos(v)/PI;c*pow(v,(1/b))*sin(v)/PI;0;0;1;0.0001;6.283185307179586;0;100;6;-2;6;U

P.S. Thank you for your scripts! This one is great (as always)