Bézier curves The bézier (bays-yay) curve method is one of way to define a curve. Different curve definitions are used and created depending on the need of the system. Some curves are more accurate while others calculate faster with a given processor. The bézier curve system uses three points to define a curve (B-splines use four points to define a curve). The two exterior points control the power and angle of the curve in relation to the center point.