> So I think issue is on POV Ray. I'm using (it's anoying work) a combination of
> "i" without dot and a separate diacritic: \u0131 and \u02ca.

\u02ca ist the wrong character. It is a "spacing" letter, not a 
"combining diacrticial mark" (which are intended to be combined with a 
letter).

See:

https://en.wikipedia.org/wiki/Spacing_Modifier_Letters

vs.

https://en.wikipedia.org/wiki/Combining_Diacritical_Marks — where the 
"combining acute accent" is at U+0301.

Lars R.

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