A highest or lowest point of a curve along a direction: the point, its parameter as a fraction of
the curve, its length from the start, its height (how far it lies along the direction, measured
from the origin), whether it is a highest point rather than a lowest, and whether it is a global
one, with no point of the curve higher, or lower for a lowest point.
A highest or lowest point of a curve along a direction: the point, its parameter as a fraction of the curve, its length from the start, its height (how far it lies along the direction, measured from the origin), whether it is a highest point rather than a lowest, and whether it is a global one, with no point of the curve higher, or lower for a lowest point.