关键词: 车灯轮廓；三次拟Bé, zier曲线；几何连续；形状控制

Abstract: In order to more effectively design the shapes of automobile headlamps, a car headlight contour design method was presented herein based on cubic quasi-Bézier curves with shape parameters. Firstly,the smooth connection conditions of piecewise cubic quasi-Bézier curve were studied. Then the car headlight contour curves were constructed using cubic quasi-Bézier spline curves. Besides,the adjustment methods of the contour curve shapes were proposed including the shapes of contour edges and corners. Finally,lights headlight contour model was obtained according to the orthographic projection curves. The contour curves might be flexibly adjusted by changing the values of shape parameters and the positions of control points. Compared with the conventional method,the curve used in this method has a lower degree and the calculation is easier. Numerical examples show that the method proposed herein is simple,effective and ease to complete interaction designs of shapes.

Key words: headlamp contour, cubic quasi-Bézier curve, geometric continuity, shape control