Part 5: Used error metrics
In the previous chapter were described methods for simplifying objects. Previous methods, however, for their work need algorithms to determine the edge or triangles that are the least important and can therefore be removed. Such algorithms are called the error metrics, and it is really the measurement errors, which causes the simplification or elimination of certain parts of the building. This way, the resulting error is measured, fundamentally affects the quality of a simplified model, it is good to consider whether to use rapid lower quality metrics, or slower, and better metrics.
25.08.2008, Schulz Roman
Part 4: Other methods for simplification
Another method, known as Vertex decimation, was introduced in 1992 by William Schroeder. It consists in choosing the lowest point with a weight according to some metrics weight point. Then there is a removal of the selected item and all adjacent triangles. Finally, there is the creation of new triangles (the so-called retriangulation) in place resulting holes. The principle is illustrated in next image
Read the rest of this entry »
23.08.2008, Schulz Roman
Part 3: Polygon reduction algorithms
There are many algorithms for simplifying objects with different features, such as efficiency, quantity of memory, scalability, etc. The most frequently used methods are described in next chapters. This chapter describes Edge collapse algorithm.
Read the rest of this entry »
16.08.2008, Schulz Roman
Part 2: Reducing level of detail
Frequently, the objects are placed at various distances from the observer. The object is distant, thus resulting in a smaller image. This can be used, to calculate the lower level of detail and object display much faster to a lesser degree of detail. The whole situation is illustrated in figures.
Read the rest of this entry »
11.08.2008, Schulz Roman
Part 1: Introduction to polygon reduction
Computer Graphics is the field of informatics, which uses computer technology to create artificial images (called rendering). This field can be divided into several areas: 3D rendering in real time (often used in computer games), computer animation, video editing special effects (often used in film and television), editing images and modeling.
Read the rest of this entry »
30.05.2008, Schulz Roman
©Polygon reducer 2000-2008 | Optimised for 1024*768