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The engine contains a simple tool to design curves (piecewise cubic Bezier 
curves). It is located in castle-engine/tools/castle-curves engine directory.
The created curves can be saved into a simple XML format and loaded into your
own Castle Game Engine programs and used for any purpose (for example as 
a track along which something moves).

This example show how to read these XML files.

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Full article:
https://github.com/castle-engine/castle-engine/wiki/Curves-tool
