The Weiler–Atherton is a polygon-clipping algorithm. It is used in areas like computer graphics and games development where clipping of polygons is needed. It allows clipping of a subject or candidate polygon by an arbitrarily shaped clipping polygon/area/region. It is generally applicable only in 2D.
How many polygons are used in Weiler Atherton polygon clipping method?
Hence, we were able to get two sub-polygons as a result of this polygon clipping, which involved a concave polygon, which resulted in: Similarly, this clipping works for convex polygons.
Which algorithm should you use to clip this polygon?
The Sutherland–Hodgman algorithm is an algorithm used for clipping polygons. It works by extending each line of the convex clip polygon in turn and selecting only vertices from the subject polygon that are on the visible side.
What is polygon clipping algorithm?
Sutherland Hodgeman polygon clipping algorithm is used for polygon clipping. In this algorithm, all the vertices of the polygon are clipped against each edge of the clipping window. First the polygon is clipped against the left edge of the polygon window to get new vertices of the polygon.
How many polygons are used in Sutherland Hodgman method?
How many polygons are used in this method? Explanation: Two polygons are used in this algorithm namely clip polygon and subject polygon. 3.
Which polygon clipping algorithm is used for concave polygon?
When the clipped polygons have two or more separate sections, then it is the concave polygon handled by this algorithm. The vertex-processing procedures for window boundaries are modified so that concave polygon is displayed.
What are the limitations of the Sutherland hodgeman polygon clipping algorithm?
Answer
- It clips to each window boundary one at a time.
- It has a “Random” edge choice.
- It has Redundant edge-line cross calculations.
What is the use of polygon clipping?
An algorithm that clips a polygon is rather complex. Each edge ofthe polygon must be tested against each edge of the clipping window, usually a rectangle. As a result, new edges may be added, and existing edges may be discarded, retained, or divided. Multiple polygons may result from clipping a single polygon.
What is polygon surfaces in computer graphics?
Polygon is a representation of the surface. It is primitive which is closed in nature. It is formed using a collection of lines. It is also called as many-sided figure. The lines combined to form polygon are called sides or edges.
What is clipping explain the method of Cohen Sutherland line clipping in detail?
The Cohen–Sutherland algorithm is a computer-graphics algorithm used for line clipping. The algorithm divides a two-dimensional space into 9 regions and then efficiently determines the lines and portions of lines that are visible in the central region of interest (the viewport).
What is polygon clipping explain Sutherland Hodgman algorithm for polygon clipping?
It is performed by processing the boundary of polygon against each window corner or edge. First of all entire polygon is clipped against one edge, then resulting polygon is considered, then the polygon is considered against the second edge, so on for all four edges.
Which polygon are correctly clipped by Sutherland Hodgman clipping algorithm?
Convex polygons
Once all vertices have been processed for one clip window boundary, the output list of vertices is clipped against the next window boundary. Convex polygons are correctly clipped by the Sutherland-Hodgeman algorithm, but concave polygons may be displayed with extraneous lines, as demonstrated in Fig.
What is the Weiler-Atherton algorithm used for?
The Weiler–Atherton is a polygon-clipping algorithm. It is used in the areas like computer graphics, games development and others where clipping of polygon is needed. It allows clipping of a subject or candidate polygon by an arbitrarily shaped clipping polygon/area/region.
What is Atherton polygon clipping algorithm?
Weiler Atherton Polygon Clipping Algorithm is an algorithm made to allow clipping of even concave algorithms to be possible. Unlike Sutherland – Hodgman polygon clipping algorithm, this algorithm is able to clip concave polygons without leaving any residue behind.
What is 1414 Weiler Atherton clip?
14. 14 Weiler-Atherton Polygon Clipping This algorithm was developed clip a fill area that is either a convex polygon or a concave polygon. The basic idea of this algorithm is that instead of proceeding around the polygon edges as vertices are processed, we will follow the window boundaries.
What are the different types of clipping algorithms?
1. Computer Graphics Clipping • Sutherland-Hodgman Algorithm (Area Clipping or Polygon Clipping) • Weiler-Atherton Polygon Clipping (Solution of Sutherland-Hodgman Algorithm ) • Cohen Sutherland Algorithm (Line Clipping)
