Calling the command:
Icon 
Ribbon 
3D Model > Construct > 3D Path by Function Assembly (3D) > Construct > 3D Path by Function Sheet Metal (3D) > Construct > 3D Path by Function Surfaces > Construct > 3D Path by Function Weld > Construct > 3D Path by Function Primitives > Construct > 3D Path by Function Support Geometry > 3D Path > 3D Path by Function 

Keyboard 
Textual Menu 
<3PL> 
Construction > 3D Path by Function 
Automenu of the <3PA> 3D Path command 

<N> 
3D Path by Function 
This command allows you to create a 3D path using a function in a given coordinate system.
There are 3 types of coordinate systems available  Cartesian, Cylindrical, Spherical. Each coordinate system has its own set of parameters. So, for example, for a Cartesian coordinate system it is proposed to specify formulas for X, Y, Z, for cylindrical with respect to ρ, φ, Z, and for spherical with respect to ρ, θ, φ.
For all types of coordinate systems, it is possible to select, create and delete a type of function.
For each type of coordinate system, it is possible to set the interval, accuracy and select the origin of the 3D path. You can also close the 3D path using the Periodic option.