[back]  3.20. helicoid 
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The helicoid [ 3,11 ] is represented by the following equations.
x = u cos(v) 
374 

y = u sin(v) 
375 

z = cv 
376 
The constant c determines the appearance of the figure.
To represent the area, the two parameters u and v can assume the following values (domain of definition), for example.
u is an element from the set of numbers [2.0, 2.0] 

v is an element of the number set [0, 2pi] 
The helicoid is a halfopen figure, so the domain of u can be changed in the plugin.
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