A single polygon can actually be split into multiple polygons can you draw an example. The weileratherton algorithm overcomes this by returning a set of divided polygons, but is more complex and computationally more expensive, so sutherland hodgman is used for many rendering applications. A convex polygon and a convex clipping area are given. Polygon clipping sutherlandhodgman algorithm geeksforgeeks. 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. Sutherlandhodgman polygon clipping algorithm thanks again for watching. Computer graphics sutherlandhodgeman polygon clipping with computer graphics tutorial, line generation algorithm, 2d transformation, 3d computer. Weiler atherton polygon clipping algorithm geeksforgeeks. Sutherlandhodgman polygon clipping algorithm youtube. Sutherlandhodgeman polygon clipping this program is for implementing sutherlandhodgeman polygon clipping. In this algorithm, all the vertices of the polygon are clipped against each edge of the clipping window. The following example illustrate a simple case of polygon clipping. Visualizing the sutherland hodgman algorithm harold serrano. It solves a series of simple and identical problems that, when combined, solve the overall problem.
Weiler atherton polygon clipping algorithm is an algorithm made to allow clipping of even concave algorithms to be possible. Input is in the form of vertices of the polygon in clockwise order examples. Input is in the form of vertices of the polygon in clockwise order. This is achieved by processing all polygon vertices against each clip rectangle boundary in turn. Before we work through an example, let me give you a brief overview of how the algorithm works.
It is performed by processing the boundary of polygon against each window corner or edge. A polygon can be clipped by processing its boundary as a whole against each window edge. Clipping polygons the sutherland hodgman algorithm clipping polygons would seem to be quite complex. The sutherland hodgman algorithm performs a clipping of a polygon against each window edge in turn. In this video, i have explained the a numerical on the sutherland hodgman polygon clipping algorithm. The sutherlandhodgman algorithm clips a polygon against all edges of the clipping region in turn. Sutherland hodgman polygon clipping algorithm sutherland algorithm hello friends. Sutherland and hodgman s polygonclipping algorithm uses a divideandconquer strategy. Sutherland hodgman can also be extended into 3d space by clipping the polygon paths based on the boundaries of planes defined by the viewing space.
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. Php polygon clipping using the sutherlandhodgman algorithm. Php polygon clipping using the sutherlandhodgman algorithm clip. It accepts an ordered sequence of verices v1, v2, v3. Sutherlandhodgeman polygon clipping programs and notes. This is a part of mumbai university mca colleges computer graphics cg mca sem 2. Polygon clipping sutherland hodgman algorithm a polygon can also be clipped by specifying the clipping window. The sutherlandhodgmanalgorithm is a wellknown algorithm for clipping a.
Program to implement sutherlandhodgeman polygon clipping. First make a list of all intersection points namely i 1, i 2, i 3. The algorithm steps from vertex to vertex, adding 0. For a polygon and clipping window shown in figure below give the list of vertices after each. Sutherland hodgeman polygon clipping algorithm is used for polygon clipping. Unlike sutherland hodgman polygon clipping algorithm, this algorithm is able to clip concave polygons without leaving any residue behind. The sutherlandhodgman algorithm is an algorithm used for clipping polygons.