Divide the curve into two curves at the point specified by t.

Returns an array with two new curves without modifying the original curve. The function expects t to lie between 0 and 1; values outside the range are constrained to 0 and 1, respectively.

This function is not a counterpart to the line.divideAt() function. The relationship between t and distance along a curve is complex and non-linear. If it is necessary to divide the curve at a certain ratio (normalized length) away from beginning of the curve, use the curve.divideAt() function.