> I disagree.  If you comment out the no_shadow modifier in the sphere and
> then render twice, once with "pass_through off" and once with 
> "pass_through
> on" within the sphere's photon block, you will see 1 image with caustics 
> and
> 1 image with no caustics, even though the sphere is a target.

Well, I guess you could look at it that way.

>...  As this seems to be the case would you agree that the end of
> section 2.6.3.2.2 is misleading? (I made an error in my first post
> referencing section 3.6.3.2.2 instead of 2.6.3.2.2  from
> http://www.povray.org/documentation/view/3.6.1/425/ )

Yeah, maybe it's not the clearest documentation.

Target makes lights enabled to emit photons cast some at
the target object.

Pass_though controls interaction with the photons, when it
is on the object doesn't bend or reflect photons, though it
can still diminish them.

No_shadow stops photons as if an object is non-transparent.

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