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Computer Graphics Perspective Projection
Computer Graphics Perspective Projection with Computer Graphics Tutorial, Line Generation Algorithm, 2D Transformation, 3D Computer Graphics, Types of Curves, Surfaces, Computer Animation, Animation Techniques, Keyframing, Fractals etc.
Perspective ProjectionIn perspective projection farther away object from the viewer, small it appears. This property of projection gives an idea about depth. The artist use perspective projection from drawing three-dimensional scenes. Two main characteristics of perspective are vanishing points and perspective foreshortening. Due to foreshortening object and lengths appear smaller from the center of projection. More we increase the distance from the center of projection, smaller will be the object appear. Vanishing Point
It is the point where all lines will appear to meet. There can be one point, two point, and three point perspectives. One Point: There is only one vanishing point as shown in fig (a) Two Points: There are two vanishing points. One is the x-direction and other in the y -direction as shown in fig (b) Three Points: There are three vanishing points. One is x second in y and third in two directions. In Perspective projection lines of projection do not remain parallel. The lines converge at a single point called a center of projection. The projected image on the screen is obtained by points of intersection of converging lines with the plane of the screen. The image on the screen is seen as of viewer's eye were located at the centre of projection, lines of projection would correspond to path travel by light beam originating from object. Important terms related to perspective
Anomalies in Perspective Projection
It introduces several anomalies due to these object shape and appearance gets affected.
 
Foreshortening of the z-axis in fig (a) produces one vanishing point, P1. Foreshortening the x and z-axis results in two vanishing points in fig (b). Adding a y-axis foreshortening in fig (c) adds vanishing point along the negative y-axis.
Next TopicParallel Projection
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