Three.js 三维模型（一）
在本文中，我们将深入探讨Three.js，这是一个广泛使用的JavaScript库，用于在Web浏览器中创建和展示3D模型。Three.js是WebGL技术的便捷接口，它使得开发人员无需深入了解底层图形编程，就能轻松构建交互式的三维场景。
我们要了解JavaScript在其中的角色。JavaScript是Web开发中的主要脚本语言，负责处理用户交互、动态内容和页面行为。在Three.js项目中，JavaScript用于创建场景、物体、光源、相机等元素，并控制它们的行为。例如，通过Three.js，我们可以创建一个3D对象，设置其几何形状、材质和纹理，然后将其添加到场景中。同时，我们还可以用JavaScript编写动画函数，使这些对象能够随时间移动或变形。
接着，CSS在Three.js项目中的应用可能并不显而易见，但它是控制2D网页布局和样式的关键。虽然Three.js主要用于3D渲染，但在实际项目中，我们常常需要将3D内容与2D界面元素（如按钮、文本和背景）结合起来。这时，CSS就用于调整3D canvas的大小和位置，使其与其他HTML元素协调。此外，CSS还可以用于设置页面的整体样式，如颜色、字体和布局，以提供良好的用户体验。
"model"文件夹则包含3D模型数据。在Three.js中，3D模型通常以各种格式导入，如OBJ、FBX、GLTF等。这些模型可以是外部设计软件（如Blender、Maya或3DS Max）创建的复杂3D对象，也可以是简单的几何形状，如立方体、球体或平面。Three.js提供了加载器来解析这些文件，将它们转换为可以在WebGL上下文中渲染的对象。一旦模型加载成功，开发者可以应用动画、变换或材质来进一步定制模型的外观和行为。
在实践中，"js"文件夹通常包含Three.js库本身以及项目特定的JavaScript代码。项目代码可能包括初始化Three.js场景、设置相机、创建光源、加载模型、实现用户交互逻辑以及运行动画循环等功能。开发者需要对JavaScript有扎实的理解，以便有效地利用Three.js提供的功能。
"css"文件夹中的文件用于定义项目的样式。这可能包括定义Three.js场景容器的CSS规则，或者处理页面上的其他2D元素。通过CSS，开发者可以控制3D视口的尺寸和位置，使其适应不同设备和屏幕尺寸。
Three.js结合JavaScript和CSS，为Web开发人员提供了一个强大的工具集，使他们能够在网页上创建引人入胜的3D体验。从加载和展示3D模型，到处理用户交互和动画，Three.js简化了WebGL的复杂性，让开发者能够专注于创造创新的3D应用场景。无论是游戏、产品可视化、虚拟现实体验还是数据可视化，Three.js都是实现这些目标的理想选择。
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