Curve can be understood as a trajectory of a moving dot.
Applet Bezier curve, change axomometry with keys from 1 to 6
Applet Bezier curve, change axomometry with keys from 1 to 6
Curves and surfaces can be defined :
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analytically - i.e. explicitly, implicitly and parametrically.
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interpolation - dots are given that are to be crossed by the curve or surface
.
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aproximately - we approach to given dots of surface or curve.