L07_3 - Perspective Projection GE101 Engineering Graphics...

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    Perspective Projection GE101 Engineering Graphics and Design
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    Perspective Projection  Characteristics Center of projection (CP) is a finite distance from object Projectors are rays (i.e., non-parallel) Vanishing points Objects appear smaller as distance from CP (eye of  observer) increases Difficult to determine exact size and shape of object Most realistic, difficult to execute
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    Perspective Sketch Horizon – observer’s eye level Ground Line – represents the plane on which the  object rests Vanishing point – position on horizon where  depth projectors converge
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    Perspective Sketch -  Foreshortening Perspective sketch of a cube For realism, foreshorten along receding axis
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    Use of Diagonals
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    Partitioning
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    Classes of Perspective Projection One-point perspective Two-point perspective Three-point perspective View from above Perspective views  are categorized  according to the  orientation of the  object with respect  to the projection  plane
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