Curve interval

@XNurbs wrote:

Dale,

When calling “ON_Interval rnCurveInterval = prnCurve->Domain();”, we want to make sure “rnCurveInterval.m_t[1] > rnCurveInterval.m_t[0]”. Would switching the two values work? (The curve may be periodic, so switching the two values may not get the right interval.)

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