Warning: this symbol is deprecated: Rendering of TRationalBezierCurve is not portable to OpenGLES (that is: Android and iOS) and not very efficient. For portable and fast curves consider using X3D NURBS nodes (wrapped in a TCastleScene) instead.
Rational Bezier curve (Bezier curve with weights). Note: for Bezier Curve ControlPoints.Count MAY be 1. (For TControlPointsCurve it must be >= 2)
Under B1 and B2 returns two new, freshly created, bezier curves, such that if you concatenate them - they will create this curve. Proportion is something from (0; 1). B1 will be equal to Self for T in TBegin .. TMiddle, B2 will be equal to Self for T in TMiddle .. TEnd, where TMiddle = TBegin + Proportion * (TEnd - TBegin).