Curve can be understood as a trajectory of a moving dot.

$$$APPLET

Applet Bezier curve, change axomometry with keys from 1 to 6

$$$APPLET

Applet Bezier curve, change axomometry with keys from 1 to 6

Curves and surfaces can be defined :
  • analytically - i.e. explicitly, implicitly and parametrically.
  • interpolation - dots are given that are to be crossed by the curve or surface .
  • aproximately - we approach to given dots of surface or curve.