看到油管的一个博主介绍了他使用 OpenSCAD 来[定义模型](https://makerworld.com/en/models/1478585-fully-customizable-ikea-components-parametric#profileId-1543526)，颇感兴趣。
[OpenSCAD](https://openscad.org/index.html) 是一款免费的工具，支持包括 Linux、Windows 和 MacOS 在内的主要操作系统。不同于常见的 3D 建模工具，它的侧重点在于 CAD 方面。更为有趣的事，它使用了[一种语言](https://en.wikibooks.org/wiki/OpenSCAD_Tutorial)来定义组件。
以下是 Google search 的 AI summary，总结了 OpenSCAD 使用的编程语言的特点——函数式编程，允许用户方便的定义几何形状并对其进行变换。
OpenSCAD uses a functional programming language that is used to define 2D and 3D models through a script. This script is a free-format list of action statements, allowing users to create and manipulate geometric primitives to build complex objects. While the syntax resembles JavaScript or C, it's not a general-purpose programming language but rather a declarative language focused on geometric descriptions.
Key characteristics of the OpenSCAD language:
- Functional Programming:
OpenSCAD's syntax is influenced by functional programming principles, where each "variable" within a scope is treated as a constant, immutable with one value.
- Declarative:
It's a declarative language, meaning the focus is on what to create rather than how to create it.
OpenSCAD doesn't have iterative assignment like `x = x + 1`, as it's designed to be stateless and declarative.
- For Loops:
C-style for loops are available for list comprehensions, but they are designed to maintain the declarative nature of the language by updating values within the iteration, rather than introducing mutable states.
- Modules and Functions:
OpenSCAD allows for defining modules and functions to create reusable components, but these are also evaluated in a stateless manner, with no side effects.
- Geometric Descriptions:
OpenSCAD code defines models through textual descriptions, which are then compiled and rendered into 3D mesh.
- Operators and Transformations:
Operators are used to modify the location, color, and other properties of objects, and are evaluated right to left.
In essence, OpenSCAD's language is a powerful tool for defining 3D models programmatically, leveraging functional and declarative principles to create complex geometries.
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