Potentially entering and leaving points - clipping, Computer Graphics

Potentially entering and leaving points - PE and PL

The intersection point of the line and window might be classified either like potentially leaving or entering. Before get further details, we describe the real meaning of potentially leaving and entering points (PL and PE). Potentially leaving and entering points are dependent upon the edge orientation, that is: direction. So now understand how to determine PE and PL; here we move anticlockwise across the window boundary then area of left hand side encloses the window.

1928_Potentially entering and leaving points - Clipping.png

Figure: (a): Potentially Entering PE and Potentially Leaving PL points

So here, we are moving from point P to point Q, and we understand that whereas traversing the windows edges in anticlockwise method the area lying on the left hand side is considered to as the window region. Consequently, from the Figure (a) in above, you may see that at point PE that we are moving from P to Q we are entering the window region, hence this point of intersection should be considered to as the potentially entering point (PE). Now, consider to the other intersection demonstrated in the Figure (a) in above, this time, also the movement of points on the line are found by varying value of parameter t is from point P to Q and  with respect to, the orientation of window boundary, we are leaving the window area. Therefore, this point of intersection is identified as potentially exiting point (PL).

PE that is potentially entering point while moving indirection of the window, the point of intersection among line PQ and the window edges faced are identified as potentially entering. PL that is potentially leaving point; these are the point of intersection encountered whereas we move away from window.

Posted Date: 4/3/2013 3:21:51 AM | Location : United States







Related Discussions:- Potentially entering and leaving points - clipping, Assignment Help, Ask Question on Potentially entering and leaving points - clipping, Get Answer, Expert's Help, Potentially entering and leaving points - clipping Discussions

Write discussion on Potentially entering and leaving points - clipping
Your posts are moderated
Related Questions
Representational Animation - Computer Animation This method permits an object to change its shape throughout the animation. There are three sub-types to this. The initial is th

Adobe flash - Softwares for computer animation Formerly, it was termed as Macromedia flash and prior to this, this was Futuresplash. This is in fact an IDE that refers to both

Introduction of Viewing  Transformations Projection is fundamentally a transformation or mapping of 3D objects upon 2D screen. Projection is mostly categorised in Para

Procedural Animation - Computer Animation This category of animation is utilized to produce real time animation that permits a more diverse series of actions to occur. These a

Painting and Drawing While we talk about graphics, we mean pictures can be either photographs or illustrations. If you want to acquire graphics into a Web page or multimedia r

Distinguish between window port & view port?  A portion of a picture that is to be displayed by a window is called as window port. The display area of the part selected or the f

computational algorithm for simulating the behavior of different physical and mathematical systems Monte Carlo methods are an extensively utilized class of computational algor

Question 1: (a) How can you select and manipulate individual objects in a group? (b) How do you resize an object? Explain how you determine the point from which the object r

Sequence of Steps to Generate a Full Animation The sequence of steps to generate a full animation would be as given below: 1)  Improve a script or story for the animation.

Differentiate between z-buffer method and scan-line method. What is the visibility test made in these methods? Solution : In depth buffer algorithm every pixel location on the