Sutherlandhodgman polygon clipping you are encouraged to solve this task according to the task description, using any language you may know. Polygon clipping sutherlandhodgman algorithm point clipping algorithm in computer graphics. Sutherlandhodgeman polygon clipping programs and notes. The sutherlandhodgman algorithm clips a polygon against all edges of the clipping region in turn. Visualizing the sutherland hodgman algorithm harold serrano. In this algorithm, all the vertices of the polygon are clipped against each edge of the clipping window. Explain sutherland hodgeman algorithm for polygon clipping. Sutherlandhodgman polygon clipping algorithm subproblem. Jun 19, 2016 2c using the previously generated polygon, repeat the sutherland hodgman algorithm to the right reference plane. The input polygons are always quads that consist of four points. The sutherland hodgman algorithm clips a polygon against all edges of the clipping region in turn.
Clipping any procedure which identifies that portion of a picture which is either inside or outside a picture is referred toas a clipping algorithm or clipping. To accomplish this task, it is not enough to clip the lines one by one with e. That article explains the algorithm and it also explains the code. The sutherland hodgman algorithm performs a clipping of a polygon against each window edge in turn. Sutherland hodgman algorithm 14 clips polygons by clipping the polygon to each window boundary in turn. Computer graphics sutherlandhodgeman polygon clipping with computer graphics tutorial, line generation algorithm, 2d transformation, 3d computer.
May 30, 2014 a simple video that explains the working of sutherlandhodgman polygon clipping algorithm in detail. Sutherland hodgman polygon clipping algorithm pracspedia. It is performed by processing the boundary of polygon against each window corner or edge. Input is in the form of vertices of the polygon in clockwise order examples. Poligon clipping sutherland hodgeman algorithm in hindi. Martinezrueda polygon clipping algorithm, does boolean operation on polygons multipolygons, polygons with holes etc. Disadvantages of sutherland hodgman polygon clipping. Oct 16, 2012 clipping algorithm in computer graphics 1.
If the first vertex is inside and the second is outside compute the intersection with the border of the clipping area and save it. The sutherland hodgeman polygon clipping algorithm 2. A convex polygon and a convex clipping area are given. The task is to clip polygon edges using the sutherlandhodgman algorithm. It solves a series of simple and identical problems that, when combined, solve the overall problem. This algorithm is considered to be the faster parametric lineclipping algorithm. What is sutherlandhodgman polygon clipping algorithm in. The following example illustrate a simple case of polygon clipping. If both vertices are inside the clipping area save the second. May 06, 2015 this algorithm is mainly used when the cohen sutherland algorithm fails when it deals with the concave polygons. Im struggling to find a good, working implementation of the sutherlandhodgman algorithm for clipping one polygon by the edges of another polygon. A scene is made up of a collection of objectsspecified in world coordinates world coordinates 3.
Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Clipping polygons the sutherland hodgman algorithm clipping polygons would seem to be quite complex. The algorithm steps from vertex to vertex, adding 0. We need an organized way to dealwith all these cases. The sutherland hodgman clipping algorithm finds the polygon that is the intersection between an arbitrary polygon the subject polygon and a convex polygon the clip polygon.
Sutherland hodgman polygon clipping algorithm thanks again for watching. 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. Ppt line clipping powerpoint presentation free to view. This is algorithm is used to clip the polygon which lies inside the window boundary. Generally, any procedure, that identifies those portion of a picture that are either inside or outside of a specified region of a space is referred as a clipping algorithm or simply clipping. This is achieved by processing all polygon vertices against each clip rectangle boundary in turn. Consider each edge e of clipping area and do following. The cohensutherland algorithm can be used only on a rectangular clip window.
If you liked it pls make it a point to comment below. The sutherlandhodgman clipping algorithm finds the polygon that is the intersection between an arbitrary polygon the subject polygon and a convex polygon the clip polygon. Multiplepolygons may result from clipping a singlepolygon. Sutherland hodgeman algorithm a divideandconquer strategy. Polygon clipping sutherlandhodgman algorithm geeksforgeeks. The sutherland hodgman algorithm is used for clipping polygons. Its a basic operation in creating graphic output of all kinds. The sutherland hodgman algorithm is a wellknown algorithm for clipping a polygon against a rectangle. In this video, i have explained the a numerical on the sutherland hodgman polygon clipping algorithm. Ppt clipping powerpoint presentation free to download. Polygon clipping algorithm by sutherland and hodgeman c program. Polygon clipping ppt free download as powerpoint presentation.
Computer graphics sutherlandhodgeman polygon clipping. The code snippet seems to be taken directly from the corresponding wikipedia article. Sutherlandhogson polygon clipping javascript github. If you liked it please leave a comment below it really. May 20, 2018 polygon clipping sutherland hodgman algorithm a polygon can also be clipped by specifying the clipping window. How to avoid death by powerpoint david jp phillips tedxstockholmsalon. The oldest one from 1974 is called the sutherland hodgman algorithm. Apr 18, 2017 12 sutherland hodgman polygon clipping the sutherland hodgman algorithm correctly clips convex polygons, but concave polygons may be displayed with extraneous lines as demonstrated in figure. Program to implement sutherlandhodgeman polygon clipping.
We will be discussing cyrusbeck algorithm in next set. A free powerpoint ppt presentation displayed as a flash slide show on id. Video explains with help of an example the working of the algorithm. Sutherland hodgeman polygon clipping algorithm is used for polygon clipping. Since there is only one output vertex list, the last vertex in the list is always joined to the first vertex. The output of the algorithm is a set of vertices defining an area that is to be shaded. Clipping polygons the sutherlandhodgman algorithm clipping polygons would seem to be quite complex. Feb 14, 2017 poligon clipping sutherland hodgeman algorithm in hindi computer graphics. Apr 05, 20 sutherland hodgman algorithm each edge of the polygon must be testedagainst each edge of the clip rectangle. May 19, 2011 sutherland hodgeman polygon clipping the algorithm begins with an input list of all vertices in the subject polygon. It works by extending each line of the convex clip polygon in turn and selecting. In the second instance, no points are saved since they both lie on the back of the plane. The liangbarsky algorithm is a line clipping algorithm. May 07, 2017 in this video we will learn sutherland hodgeman polygon clipping algorithm.
Next, one side of the clip polygon is extended infinitely in both directions, and the path of the subject polygon is traversed. Sutherland hodgman polygon clipping algorithm with. In geometry a polygon is a flat shape consisting of straightlines that are joined to form a circuit. Sutherlandhodgman polygon clipping algorithm youtube. Windowing conceptsclipping introduction brute force cohen sutherland clipping algorithmarea clipping sutherland hodgman area clipping algorithm 2. 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. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Polygon clipping algorithm by sutherland and hodgeman c. The sutherland hodgeman polygon clipping algorithm. Polygon clipping sutherland hodgman algorithm a polygon can also be clipped by specifying the clipping window. The sutherland hodgeman polygon clipping algorithm 1. There are several wellknown polygon clipping algorithms, each having its strengths and weaknesses. Consider the concave polygon in the picture below by just clipping the lines it is divided in several separate polygons.
In the first case, p1 is in front of the plane and p2 is on the back. A working implementation of the sutherlandhodgman algorithm. A polygon can be clipped by processing its boundary as a whole against each window edge. Sutherland and hodgmans polygonclipping algorithm uses a divideandconquer strategy. The sutherland hodgeman polygon clipping algorithm slideshare. Input is in the form of vertices of the polygon in clockwise order.
For other convex polygon clipping windows, cyrusbeck algorithm is used. Thus, an intersection point is calculated and saved. Ppt window viewport and clipping powerpoint presentation. There are 4 rules explained in sutherland hodgman algorithm for clipping polygons. Clip polygon pto clipping edge foreachedge in polygon p check clipping cases there are 4 case 1. May 11, 2011 program to implement sutherland hodgeman polygon clipping algorithm may 11, 2011 vaibhavwp leave a comment go to comments program to implement sutherland hodgeman polygon clipping algorithm. Sutherland hodgman polygon clipping algorithm clip boundary inside outside s boundary inside outside s p boundary inside outside p s i s clip boundary inside outside i p p added to output list i added to output list no output i and p added to output list p for each clip edge scan the polygon and consider the relation between successive. The algorithm you present is not the sutherland hodgman algorithm for clipping against an arbitrary polygon, but the cohen sutherland algorithm for clipping against a rectangular viewport.
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