Yes, those conditions should be equivalent.
It seems to be a precision-related issue, since the correct result is achieved
by adding some very small value to D in the condition (X <= D). Also, when the
loop is shorter, e.g. D=1, the result is correct for X = X + 0.1
The second version works because for some reason the condition (X = D) evaluates
correctly. However, the conditions like (X != D) (X <= D) etc do not.
I tested this under official 3.1g (Windows & Linux) and Megapov 0.4g (Windows)
and due to the inconsistency regarding conditional operators, it looks like a
bug to me. Comments?

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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