Ensayo

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  • Publicado : 12 de octubre de 2010
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16/02/2010

Three Dimensional Viewing

General three-dimensional transformation pipeline,

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Photographing a scene involves selection of the camera position and orientation.A righthanded viewing-coordinate system

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Orientation of the view plane and viewplane normal vector N

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The View-Up Vector
• This vector is used toestablish the positive direction for the yview axis

uvn viewing-coordinate reference frame

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Generating Three-Dimensional Viewing Effects

Viewing an object from differentdirections using a fixed reference point.

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TRANSFORMATION FROM WORLD TO VIEWING COORDINATES

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Parallel projection

Perspective projection

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16/02/2010Orthogonal projections

Axonometric and Isometric Orthogonal Projections

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Clipping Window

Orthogonal-Projection View Volume

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Normalization Transformationfor an Orthogonal Projection

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OBLIQUE PARALLEL PROJECTIONS

Oblique parallel projection

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Cavalier

Cabinet

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Projection vectorVp

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Oblique Parallel-Projection Transformation Matrix

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Normalization Transformation for an Oblique Parallel Projection

Perspective projection

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Perspective-Projection Transformation Coordinates

Perspective-Projection Equations: Special Cases

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Projection reference point is between the object and the viewplane

Moving the projection reference point

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Principal vanishing points for perspectiveprojection views of a cube

Perspective-Projection View Volume

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16/02/2010Perspective-Projection Transformation Matrix

Symmetric Perspective-Projection Frustum

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Field-of-view angle

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Oblique Perspective-Projection Frustum...
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