1 Introduction

Viewing Transformations: 3D to 2D

1.1 Coordinates in Viewing Transformations

1.2 Transformations in Viewing Transformations

1.3 Canonical view volume

Projection Transformation

为了了解canonical view volume规范视空间，先看一下要用到的两种透视变换，它们的视空间分别对应一个棱台和一个长方体

• Perspective projection vs. orthographic projection

canonical view volume规范视空间

• It is the cube [–1,1]3, viewed from the z direction
• coordinates in it are called “normalized device coordinates” (NDC)

2 Viewing Transformation

2.1 Viewport transformation

2.1.1 Windowing transforms