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表面建模

曲面建模是一种显示或呈现实体对象的方法。这一过程涉及不同三维建模类型之间的转换,例如转换三维对象以显示程序曲面、检查瑕疵、应用平滑度等。曲面建模比线框建模更复杂,但比实体建模更容易实现。

虽然可以在 CAD 环境中完全使用曲面建模来创建模型,但大多数实际应用都需要结合实体建模技术。设计人员如何在 CAD 系统中操作对象是实体建模与曲面建模的区别所在。

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曲面建模解析

曲面建模让您能够直观地展现物体的外观和轮廓——也就是它的表面。

该对象可以是机械部件,例如发动机,或是复杂的有机形态,例如动物。

无论您设计什么产品,曲面建模都涉及定义物体的外部曲线和形状。

与实体建模不同,曲面模型在几何形状和物理属性上都不精确,没有明确的质量属性且没有厚度,这使得设计师能够以实体建模无法实现的方式修改模型。

然而,曲面模型本质上是空心的,因此不能像实体模型那样被切割开。

另外,请注意,曲面可以根据需要以NURBS或多边形的形式呈现。在Solidworks中,曲面建模通常采用NURBS。

那么,你可以用曲面建模做些什么?

曲面建模利用B样条和贝塞尔方程来定义物体在三维空间中呈现的特征,并广泛应用于建筑插图、电子游戏3D动画等领域。它相对于其他技术具有一些显著优势:

  • 修改导入的模型
    • 将现有模型导入到原本未构建该模型的CAD环境中可能会引发许多问题,最重要的是导入后可能缺失原先配置的功能细节。
    • 在缺乏这些详细信息的情况下,对复杂曲面进行修改非常困难。曲面建模赋予您灵活性,可以删除或替换模型中的面,以实现所需的更改。
  • 设计更复杂的形状
    • 实体建模工具的局限在于它们要求您一次创建一个形状的多个面。而曲面建模允许您单独创建各个面,从而精确控制它们的轮廓和方向。
  • 在面之间创建倒圆角或拔模
    • 在实体建模中,当尝试在物体的两个或多个面之间创建拔模或倒圆角时,可能会出现错误提示“Invalid, cannot create feature”。即使更换不同的设置和工具,错误仍可能发生。
    • 这种情况可能是由于修改后导致面自相交,但利用曲面建模,您可以删除并重构这些面,然后将它们重新拼接回原有设计中。

哪种建模方法更好?

曲面建模与实体建模各有优势与局限,优秀的设计师需要了解如何利用它们,在CAD环境中高效且准确地设计模型。

虽然实体模型可以进行切割和拉伸,但曲面建模更适合于塑造网格对象。设计师可以通过“拖动”边缘来操控网格面,设置平滑度等,从而完善设计。

了解我们的解决方案

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三维建模

我们很自豪能够与 ACIS 一起率先开发几何内核。如今,我们提供的解决方案可满足您的三维几何表示需求。无论您需要连续还是离散的 B-Rep 建模器,我们都能为您的特定应用需求提供解决方案。

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3D 互操作性

作为首家提供 CAD 互操作性 SDK 的公司,我们现在提供业界领先的解决方案,用于翻译数据和读取主要 CAD 文件及元数据。让您的客户能够像在自己的应用程序中创建数据一样使用导入的 3D 数据,或将数据导出为各种 CAD 格式。

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三维可视化

使用我们的三维可视化 SDK 创建高性能、交互式可视化。HOOPS 解决方案可让您利用业内最强大、最便携和最完整的图形开发组件来创建 3D 应用程序。

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三维网格划分

使用我们的 CAE 网格绘制 SDK,提高仿真的精度和性能。体验自动、可靠的网格划分控制,确保为任何 CAE 工作流程提供准确、高性能的仿真。

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应用框架

应用图形管理器 (AGM) 是一个全面的 3D 应用开发框架,可缩短产品上市时间并降低成本。

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