PPT-Clipping Concepts, Algorithms for line clipping

1 of 16 Clipping 101217 Clipping endpoints If x min x x max and y min y y max the point is inside the clip rectangle Endpoint analysis for lines. Clipping. CMSC 435/634. Graphics Pipeline. Object-order approach to rendering. Sequence of operations. Vertex processing. Transforms. Vertex components of shading/texture. Clipping. Find the visible parts of any primitives. Computer Graphics . :. Viewing In 2D. Contents. Windowing Concepts. Clipping. Introduction . Brute Force. Cohen-Sutherland Clipping Algorithm. Area Clipping. Sutherland-Hodgman Area Clipping Algorithm. Viewing In 2D. Contents. *. Windowing Concepts. *. Clipping. Point Clipping . Line Clipping. . -Cohen-Sutherland Clipping Algorithm. *. Area Clipping. Sutherland-. Hodgman. Area Clipping Algorithm. Images were taken from the book: “Interactive Computer Graphics” by Angel and Shreiner. Normal Vectors. How to compute the normal per . planar. face?.  . Normal Vectors. However, vertex normals are not well defined. Clipping. CMSC 435/634. Graphics Pipeline. Object-order approach to rendering. Sequence of operations. Vertex processing. Transforms. Vertex components of shading/texture. Clipping. Find the visible parts of any primitives. Lecture . 7. : 2D Clipping Algorithm. Recap. 2D Viewing pipeline. Model .  . World .  View  Device. Model to view transformation. Viewing  Clipping. . 2D viewing in OpenGL. Objective. CSCI 440. textbook section 8.3-8.7. Starter Question. How do we clip these lines?. X=-5. Y. =-5. Y=5. X=5. [0,0]. [3,3]. [7,-3]. [0,-3]. formula from . wikipedia. Goals of Clipping. Reject, Accept, or Accept a portion. 1. Clipping. Clipping is a process of dividing an object into visible and invisible portions and displaying the visible portion and discarding the invisible portion.. Types of Clipping:. Generally we have Clipping algorithm for the following primitive type:. Introduction to Computer Graphics. Forward Rendering Pipeline. Clipping and Culling. Rendering Pipeline. Sequence of operations that is used to draw primitives defined in a 3D coordinate system on a 2D window. Lecture 1. 2. : . 3D Clipping. Recap. Parallel projection. Normalized coordinate transformation. . Orthographic. . Oblique. . Perspective. Objective. After completing this lecture students will be able to. Forward Rendering Pipeline. Clipping and Culling. Rendering Pipeline. Sequence of operations that is used to draw primitives defined in a 3D coordinate system on a 2D window. Can be implemented on . hardware. CMSC 435/634. Graphics Pipeline. Object-order approach to . rendering. Vertex Processing. Clipping. Rasterization. Fragment Processing. Visibility & Blending. Transformations. Vertex components of shading. Types of Clipping:. Generally we have Clipping algorithm for the following primitive type:. Point Clipping. Line Clipping . Area Clipping (Polygon). Curve Clipping. Text Clipping. . 2. Point Clipping. Clip Coordinates vs. NDC. Clip space (left-handed). Clip. coordinate. Normalized device. coordinate . (NDC). Culling: discarding . invisible. polygons. Back-face culling. Discarding all faces (i.e., polygons) that face “backward” (i.e., whose .