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The worm [ 6 ] is represented by the following equations. To keep the formulas a little clearer, we use the constant h.
h = e ^{u/(6pi)} 
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x = a (1  h) cos(u) cos(0.5 v) cos(0.5 v) 
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y = 1  e ^{u/(b pi)}  sin(v) + h sin(v) 
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z = a (1 + h) sin(u) cos(0.5 v) cos(0.5 v) 
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To represent the area, the two parameters u and v must have the following values (definition range).
u is an element from the set of numbers [0, 6 pi] 

v is an element of the number set [0, 2 pi] 
The value u _{Max} determines the number of windings of the worm, with u _{Max} = 6 pi there are 3 windings.
The domain of definition of v is required to get a complete circle as a crosssection, it cannot be changed with the plugin.
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