In order to realize the geometric modeling of plant flowers of crown united, taking tobacco flower as an example, a flower modeling method based on ball B-spline curve and parametric surface was proposed. Morphological characters were analyzed. Firstly, 3-D shape of each parts with mathematics were described and the control parameters were get. And then, visualization of them with relative color and topology information were realized. The results showed that proposed method could effectively simulate tobacco flower with good controllability. The models showed more reality, which provided a new technique for explicit modeling of other similar flowers.%为实现花冠联合植物的花朵几何建模,以烟草花为例,提出了一种基于球B样条曲线和参数曲面的花朵造型方法.通过对烟草花形态结构的观测分析,分别对雌蕊、雄蕊、花柄、花冠和花萼的几何形状进行了数学描述,提取了模型控制参数;结合颜色渲染色和整个花的拓扑信息,实现了烟草花整个模型的建立.实验结果表明,该方法可以有效地对烟草花进行模拟,可控性强,建立的模型有较高真实感,为其他花冠或花萼联合的植物几何建模提供了方法.
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