Hi Sergey

> I guess you can use "getDeterminant()==0" to determine if this transform has
> no inverse?

Initially I had the same idea, but looking at the implementation of
invert(), I found several different conditions leading to an
NoninvertibleTransformException. So I decided to keep the call to
invert(), as the code-path shouldn't be performance critical anyway.

Best regards, Clemens

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