cg-rendering-pipeline
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CG渲染管道是计算机图形学中的一个关键概念,它是指从原始数据到最终图像生成的一系列步骤。这个过程涉及多个阶段,每个阶段都有特定的任务,旨在优化性能并提高图像质量。在"cg-rendering-pipeline"项目中,我们可以看到开发者利用JavaScript来实现这一流程,这在WebGL或Three.js等Web图形库中尤为常见。 1. **预处理阶段**:在这个阶段,场景被设置,包括定义几何形状、纹理、光源等。JavaScript可以用于创建和管理这些对象,例如通过JSON格式加载3D模型,处理纹理映射,以及定义光照参数。 2. **几何阶段**:此阶段处理的是场景的几何表示。几何体可能需要经过坐标变换(如平移、旋转和缩放)来定位到正确的位置。JavaScript可以使用矩阵运算进行这些变换,比如使用四元数处理旋转,向量操作进行平移和缩放。 3. **投影阶段**:将3D几何体转换为2D投影,通常使用透视投影或正交投影。JavaScript中的WebGL API提供了相应的函数来设置视口和投影矩阵。 4. **裁剪阶段**:在此阶段,超出视口的几何体部分被剔除,以减少后续处理的负担。WebGL内建的裁剪操作会自动处理这一点。 5. **光栅化阶段**:3D几何体被转换为屏幕上的像素,称为片段。每个片段都会经历颜色计算,这通常涉及到光照模型的计算。JavaScript可以实现各种光照算法,如Phong、Blinn-Phong或Lambert模型。 6. **着色阶段**:片段着色器执行此任务,计算每个像素的颜色。JavaScript中的WebGL支持顶点着色器和片段着色器,允许开发者编写自定义的着色逻辑。 7. **混合阶段**:新绘制的像素与已有图像进行混合,根据深度信息决定哪些像素应该覆盖哪些。WebGL的混合模式和深度测试可以控制这一过程。 8. **后处理阶段**:可以应用额外的效果,如抗锯齿、景深、雾化等。这通常通过全屏传递技术实现,JavaScript可以创建额外的渲染目标和着色器来完成这些效果。 在"cg-rendering-pipeline-main"文件中,我们可能会找到实现这些阶段的源代码,包括JavaScript脚本、WebGL着色器语言(GLSL)代码,以及可能的资源文件如模型、纹理和配置数据。通过分析和理解这些文件,开发者可以深入理解CG渲染管道的工作原理,并能够创建出复杂的交互式3D图形应用程序。
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