Transcription of Orthographic and Perspective Projection
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Orthographic and Perspective Projection
Chapter 10 Orthographic andPerspective Projectionraycastingobject space rendererprojectionscreen space rendererWe have been, until now, creating images by raycasting. By shooting rays fromthe eyepoint out into the scene, we determine what is visible at the screenpixel that the ray passes through. This type of renderer is called an object (orscene) space renderer, since all viewing calculations are done in the world spaceof the scene. This approach is depicted above to the left. We are about tobegin looking atOpenGL, which uses a very different approach. OpenGL usesa screen space rendering approach, as depicted above to the right, which worksby:1. transforming all scene objects from world coordinates to camera coordi-nates by a viewing transform,2.
ence for processing after the projection is performed, which decouples shading and display of an image from the projection system used. The typical canon-ical view volume is a 2x2x2 cube aligned with the coordinate axes in viewing coordinates, and centered at the origin. The idea is that no matter what the
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