Hi,

I'm fairly new to povray but otherwise not a noobie.

I'm trying to simulate a confocal imaging system where I have a pattern that
will be projected through a lens to a surface (and in the next phase project
the projected pattern from the target  back through the same lens and a half
transparent mirror  to an other surface (sensor).

Something like in this sketch:

http://www.eazycnc.com/temp/sketch.png


I've created all the parts and individually they seem to be alright, however the
'photon mapping' is not working.

To debug I've simplified the setup to just a spot light source that illuminates
the pattern and a surface on which the light from that pattern should be
visible.

The illuminated pattern (Source in the code) looks like this when rendered in
povray:

http://www.eazycnc.com/temp/pic1.png

And the surface (Target) that is supposed to shine some of this pattern's light
looks like this:

http://www.eazycnc.com/temp/pic2.png

The code can be downloaded from here:

http://www.eazycnc.com/temp/lens2.pov

In the pic2 the source pattern can be seen through specular reflection but if I
turn on the diffuse reflection and turn off the specular reflection then the
'Target' is just black where as I think it should 'glow/reflect' some green
light (of course it should not show the patter because the lens is not there
yet).

So what am I doing wrong, or is this a wrong approach or is povray the wrong
tool for this?

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