Am 11.09.2016 um 14:40 schrieb Jim Holsenback:

> Well that section was awkward to begin with ... since it was so short I
> just rewrote the whole thing:
> 
> http://wiki.povray.org/content/Reference:Light_Source#Looks_Like

I find "important things to consider" item 5 quite confusing: Is it
intended to apply to a regular looks_like object, or the union alternative?

Personally I'm quite sure it's the latter, but I would suggest to
instead use wording like:

    4. use a union instead if you want the object to
       block light (remember to make /some/ portion of
       the object transparent)

Also, the union example is broken, as in contrast to looks_like the
union doesn't auto-translate My_Lamp_Shape to the location of the light
source.

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