p1 and p2 using t.
@param p0 The starting control point.
@param p1 The second control point.
@param p2 The third control point.
@param p3 The final control point.
@param t Should be between zero and one. Zero will return point p1 while one will return p2, a value in between will return an interpolated vector between the two.
@return The interpolated vector.
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