Sets or returns the right tangent X (in frames) of the fcurve
key relative to the FCurveKey.Time value as a Double.
The right tan x value may be a positive value between a distance
which is one third the distance between 2 consecutive key and 0;
this guarantees that the curve is valid.
The left tangent of the first key and the right tangent of the last
key cannot be changed; if you try to set the tangent for one of
these the property does nothing and returns S_FALSE in C++.
Tangent values only apply to standard function curves (where
FCurve.Type = siStandardFCurve), the
tangent value 0 is returned for all other function curve types
defined by siFCurveType.
/*
See FCurveKey.LeftTanX for JScript, VBScript and Python examples using this property.
*/
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