2 Dimensional Viewing Transformation

Introduction

When we define an image in some world coordinate system, to display that image we must somehow map the image to the physical output device. This is a two stage process. For 3 dimensional images we must first project down to 2 dimensions, since our display device is 2 dimensional. Next, we must map the 2 D representation to the physical device. This section concerns the second part of this process, i.e. the 2D WDC to 2D physical device coordinates (PDC). We will first discuss the concept of a Window on the world (WDC), and then a Viewport (in NDC), and finally the mapping WDC to NDC to PDC.

Window

Viewport

Viewing Transformation: Window to Viewport to Physical Device

Viewing Transformations
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Last changed September 30, 1998, G. Scott Owen, owen@siggraph.org