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From Odwiki

This program converts between different 3D texture files and geometry files. According to the program usage, it seems to handle three different 3D texture formats

1. 3D Texture files (i3d)
2. PhotonMap (.pmap) files
3. IrradianceCache files (no particular ext, use .pc maybe)
4. PointCloud files (.pc)

The program can convert between these FileFormats and geometry files (.geo).

Note: To visualize a photon map, you might try running

   % i3dconvert photon.map stdout | gplay stdin

To see where all the photons are, you'll have to turn display of points on.