Lecture 1 - Projections and Transformations (slides)

3 1 2 3 projections of wire frame models wire frame

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Unformatted text preview: pological Data! •  Details of what is connected to what.! Vertex data! Face data! Index! Graphics Lecture 1: Slide 18! Vertices! (0, 0, 0)! 0! 0 1 3! 1! (1, 0, 0)! 1! 0 2 1! 2! (0, 1, 0)! 2! 0 3 2! 3! Index! 0! Location! (0, 0, 1)! 3! 1 2 3! Projections of wire frame models ! •  Wire frame models simply include points and lines. ! •  In order to draw a 3D wire frame model we must: ! –  First convert the points to a 2D representation.! –  Then we can use simple drawing primitives to draw them. ! •  The conversion from 3D into 2D is a projection. ! Graphics Lecture 1: Slide 19! Projection! The projector takes a point on the object to a point on 2D projection surface.! ! Graphics Lecture 1: Slide 20! Non-linear projections ! •  In general it is possible to project onto any surface: ! –  Sphere! –  Cone! –  Etc.! •  or to use curved projectors, for example to produce lens effects. ! •  But we will only consider linear projections onto a flat (planar) surface. ! Graphics Le...
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This document was uploaded on 03/26/2014.

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