Return a point on the curve at a point specified by
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.pointAt() function. The relationship between
t and distance along a curve is complex and non-linear. If a point at a certain
ratio (normalized length) away from beginning of the curve is needed, use the