well, i had time to render a little animation with higher photon layer
resolution:

http://www.wg-ffhm.de/povray/photonsInvisObj3RGB-Colored.avi

(its the isosurface in mentioned above: a bumby sphere)
i colored the object verticaly in stripes with red, green, blue

another 3d-Photon-Layered map with a normal lense-caustics, shaped like a
trumpet
same colors: http://www.wg-ffhm.de/povray/photons1-lense-trumpet.png

note that the objects themselves are not visible

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