Before double_illuminate was introduced, surfaces of some objects would
become double-illuminated under various (mostly undocumented) circumstances.
In MegaPOV and then later in the official POV-Ray, we made the behavior
consistent and unambiguous, but then added the double_illuminate keyword to
allow the feature (a.k.a. bug) to be turned back on when it was needed (thus
making it a true feature and not a bug).

The bicubic_patch was notorious for always being double-illuminated before
this change was introduced.

-Nathan

"Slime" <fak### [at] emailaddress> wrote...
> > Does anyone know what change in newer versions of PovRAY cause the
objects
> > to be completely opaque and what I would need to change to make them
only
> > "mostly" opaque as they were in version 1.0?
>
>
> "composite" must be ancient, I'm not sure I've even heard of it before.
>
> Anyway, the objects *are* opaque, they have no transparency in their
colors.
> Maybe you want double_illuminate?
>
>  - Slime
>  [ http://www.slimeland.com/ ]
>
>

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