What is Sutherland line clipping algorithm?
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).
How many polygons are used in Sutherland Hodgman clipping method?
Cohen- Sutherland is line clipping algorithm. 2. How many polygons are used in this method? Explanation: Two polygons are used in this algorithm namely clip polygon and subject polygon.
Which of the following is polygon clipping algorithm?
A convex polygon and a convex clipping area are given. The task is to clip polygon edges using the Sutherland–Hodgman Algorithm.
What are the limitations of the Sutherland hodgeman polygon clipping algorithm?
Disadvantages of sutherland hodgman polygon clipping algorithm
- 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 line clipping and polygon clipping?
Note the difference between this strategy for a polygon and the Cohen-Sutherland algorithm for clipping a line: The polygon clipper clips against four edges in succession, whereas the line clipper tests the outcode to see which edge is crossed, and clips only when necessary.
What is Sutherland Hodgman 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.
What is polygon clipping in graphics?
Polygon clipping is a process in which we only consider the part which is inside the view pane or window. We will remove or clip the part that is outside the window.
What is the use of polygon clipping?
A polygon can also be clipped by specifying the clipping window. 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.
What is use of Sutherland-Hodgeman algorithm explain it?
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.
Which is the clip polygon in Sutherland Hodgman?
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”).
How is the edge of a polygon clipped?
The edge (of clipping area) is extended infinitely to create a boundary and all the vertices are clipped using this boundary. The new list of vertices generated is passed to the next edge of the clip polygon in clockwise fashion until all the edges have been used.
How does a polygon Clipper work in Photoshop?
In polygon clipping, we use an algorithm that generates one or more closed areas that are then scan converted for the appropriate area fill. The output of a polygon clipper should be a sequence of vertices that define the clipped polygon boundaries. We can correctly clip a polygon by processing the polygon boundary as whole each window edge.
Where are polygon clipping results stored in memory?
Then clipping against left edge done and output is stored. Then clipping against right edge done, then top edge. Finally, the bottom edge is clipped. Results of all these operations are stored in memory. So wastage of memory for storing intermediate polygons.