{
	Cubic Bezier Interpolating Function

	02Mar90
}
bezier(p1, p2, p3, p4, t) = 	p1 * (1+t*(-3+t*(3-t))) +
				p2 * 3*t*(1+t*(-2+t)) +
				p3 * 3*t*t*(1-t) +
				p4 * t*t*t ;