Am 21.03.2017 um 15:12 schrieb William F Pokorny:

> Aside: I thought the second diffuse parameter required a proceeding
> comma, but if working OK for you must not be the case... :-)

All commas in POV-Ray's scene description language are optional --
unless the second expression has a leading `+` or `-` sign, which would
be interpreted as a mathematical operation without a comma; it is
therefore a good habit to make liberal use of commas.

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