Hi Eriban!

Your code works like a charm. I am learning on the spot and have just 
adapted it a little to make it work with my scene. Simple.

A few comments, based on a couple of observations of wakes I chanced to 
notice:

1) When a ship moves slowly (wake_angle = approching 80 or 90 degrees) the 
bow waves seems to be convex-shaped;
2) When the ship moves fast (wake_angle sharper than 45 degrees) the bow 
waves seems to be concave-shaped.

As your bow wave is linear, would that be possible to implement somehow?

You will soon see the use of your code in my image to the current challenge 
at the TC-RTC site (theme: Dragons).

Thank you again for your work.

Thomas

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