Given that Thomas was interested in it, I am attaching the code that I used to
generate the wake waves in my Rock The Boat image (see p.b.i).

A few disclaimers:
- It's created specifically for my Rock The Boat scene. This image required an
assymetrical wake, which makes the code more complicated than would be required
for a "simple" symmetrical wake.
- It has a few comments, but not enough to be easily understood.

Nevertheless, it may give some inspiration/useful suggestions on how to create
wakes for your own scenes.

The scene should be used with animation enabled to generates three image maps:
1. An image map with wake waves (as well as the waves caused by the wind). It is
to be used in a height_field, e.g.
    height_field {
      png "MakeWake1.png"
      smooth

      // Move water level down to y=0
      translate -y * 0.5

      // Reduce size of waves
      scale <1, 0.002, 1>
    }

2. A partially masked version of the first image, only needed to make the
illusion work. Just ignore this one.

3. An image map that provides a mask to be used as an image pattern for a
texture map. E.g.
    texture {
      image_pattern {
        png "MakeWake3.png"
      }

      texture_map {
        [0.00 FoamyWaterTexture]
        [0.05 FoamyWaterTexture]
        [0.20 QuietWaterTexture]
        [0.40 QuietWaterTexture]
        [0.55 ChoppyWaterTexture]
        [0.75 QuietWaterTexture]
      }
    }

Cheers,
Erwin

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Attachments:
Download 'makewake.pov.txt' (12 KB)