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For orthographic parallel projection:
glOrtho(left, right, bottom, top, near, far);
glOrtho2D(left, right, bottom, top);
Here left, right define the x-direction extents, bottom, top define y-direction extents and near, far define the z-direction extents of the view volume. gluOrtho2D is exactly like glOrtho, but with near = -1 and far = 1. That is, gluOrtho2D views points that have z-value between -1 and 1. Usually, gluOrtho2D is used when drawing two-dimensional figures that lie in the xy-plane, with z = 0.
Three Dimensional Transformations A 3D geometric transformation is used extensively in object modelling and rendering.2D transformations are naturally extended to 3D situations
Cohen Sutherland Line Clippings Algorithm The clipping problem is identified by dividing the region surrounding the window area into four segments Up as U, Down as D, Left as
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when dda line drawing algorithm is more efficient than bresenhem line drawing algorithm?
Magnify a triangle with vertices A = (1,1), B = (3,1) and C = (2,2) to twice its size in such a way that A remains in its original position. Answer: You need to apply scaling b
properties that helps in reducing efforts
Gourand shading OR Intensity interpolation scheme Now there polygon is rendered through linearly interpolating intensity values across the surface. Intensity values for all po
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