[back]  3.42. Pillow shape 
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The pillow shape [ 8 ] is represented by the following equations.
x = cos(u) 
3141 

y = cos(v) 
3142 

z = a sin(u) sin(v) 
3143 
The constant a 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 [0, pi] 

v is an element from the number set [pi, pi] 
Since the pillow shape is a closed figure, the definition range must be adhered to exactly, it cannot be changed with the plugin.
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