Computer graphics refers to the creation, manipulation, and rendering of images using computers. It is an interdisciplinary field that draws on mathematics, physics, engineering, and art to create visually stunning graphics Computer graphics has become an integral part of various industries, and as a result, there is now a wide range of graphics hardware and … Read more
Computers have revolutionized the way we produce pictures, making them faster and more cost-effective. Nowadays, graphical displays are widely used in almost every field, making computer graphics an indispensable tool. Earlier, using computer graphics required expensive and bulky equipment. However, with advancements in technology, interactive computer graphics have become more practical. We now see computer … Read more
In contrast to the scan line and area coherence algorithms, priority algorithms try to discover the depth relations first and then perform the xy calculations only after the visibility has been established. They are similar to the priority algorithms of scan conversion. Remember the painters algorithm? A painter drawing a painting on a canvas simply … Read more
This is one of the class of “area” algorithms. It tries to solve the hidden surface problem recursively. The algorithm proceeds on the following lines. i. Try to solve the problem by taking the entire screen as one window. If no polygons overlap either in x or y or even if they do, overlap so … Read more
Another property of coherence that can be made use of in scan conversion is the one-dimensional form of area coherence, called span coherence. If a pixel is inside a polygon, it’s neighbours also lie inside the polygon. This holds good upto a “Span” once the Span is detected, all pixels within the span can be … Read more
Scan line algorithms solve the hidden surface problem, one scanline at a time. They traverse the picture the picture space from top to bottom, one line at a time removing all the hidden surface along that scan line. The simplest of them can be the depth buffer algorithm itself. Since the algorithm has to consider … Read more
The concept of this algorithm is extremely simple and straightforward. Given a given resolution of the screen, every pixel on the screen can represent a point on one (and only one) object (or it may be set to the back ground if it does not form a part of any object). I.e. irrespective of the … Read more
Every point needs to be checked as to whether it lies within the visible area of the pyramid by comparing the values of (D/S) xe and (D/s) ye to the end values of the visible area This will exclude all points beyond the view point (ze ≤ 0) and all points that go beyond the … Read more
The direct application of the perspective conversion may end up mapping the object to size of the window, also points beyond the view port may also get mapped. To circumvent these problems, the object generated needs to be clipped against a viewing pyramid. The concept is similar to the 2- dimensional case
A perspective display can be generated by simply projecting every point of the object on to the plane of the screen. This section teaches you to get the coordinates (xs – ys) in the screen coordinates with respect to the eye coordinates (xe, ye, ze). Consider the above figure, which indicates the basics of the … Read more