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They are composed and selected in the Laws Editor which is specific to each tool that uses laws and can be opened from that tool.

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To use a the Curve from Law tool:

1. Select the tool. The Laws Editor opens.
2. Select the desired law in the Laws table by double-clicking and press OK. The law that is applied is what is in the formula field.
   
3. Set the U-min and U-max either by entering a values in the Inspector Bar or by selecting two points. (U-min defaults to zero (0))
    
    

To create a law:

1. Type the desired formulas into the formula fields.
   
2. Press the + (plus) button.
    
3. Type in a titke for the law and press OK.
   The new law will appear in the Laws table
    

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1. Open the Laws Editor.
2. Click on the Law in the Laws table to select it.
3. Right click and select Delete, or press the - (minus) button.
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 Laws cannot be edited but double click a law will load it into the Formula fields where it can be altered and then a new altered law added.

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Setting x(u)=(5+cos(u))*cos(u/48), y(u)=(5+cos(u))*sin(u/48), z(u)=sin(u), U min = 0, U max = 301.579987

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Setting x(u)=cos(u), y(u)=u, z(u)=uImage Added

Demo Video: