> Recently, I started building mesh2s following Earth's curvature from 
> SRTM Earth elevation data (3 arcseconds per data point)... when 
> rendering those mesh2s, I found some strange artifacts (gaps between 
> triangles, see image on p.b.i.) which probably resulted from floating 
> point inaccuracy (the scale I used is 1 POV unit = 1 kilometre).

  I bet it's a bug in your conversion program instead (or, alternatively,
something which gets fixed if you apply double illumination).

> As Christoph Hormann, as he writes on his website, apparently uses a 
> kind of (self-written?) conversion tool, I thought that converting my 
> mesh2s to isosurfaces possible could solve the gaps problem...

  Do you really want your earth model to render a hundred times slower?

-- 
                                                          - Warp

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