I saw this cinema 4d paper plane tutorial and I thought of a third technique for making dashed splines.
You can make this by using an alpha material channel. With this trick you can use the aerodynamics (or any other dynamic), trace the path, extrude lines and use material to make it dashed.
The original tutorial: vimeo.com/95696134
You can download the scene file her: dl.dropboxusercontent.com/u/2747931/Paperplane.c4d
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