August 2014
Intermediate to advanced
951 pages
27h 53m
English
Content preview from Computer Graphics Through OpenGL, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 9
Orientation
The notion of orientation is vitally important in CG when drawing 3D scenes but, unfortunately, often confusing for the beginner. OpenGL itself makes critical use of orientation to determine the visible side of a surface. Note that the word “orientation” in the current context relates to handedness, e.g., clockwise or counter-clockwise, as we shall see, and has nothing to do with the orientation of a camera as discussed in Section 4.6.3, where the word meant pose or arrangement. The goal for this chapter is an understanding of orientation and its utility in CG.
The first section motivates the concept of orientation with a benign thought experiment. Section 9.2 describes how OpenGL applies orientation to determine the particular ...
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