By Theoharis Theoharis
This e-book is the results of the learn within the implementation of polygon-based photographs operations on yes normal objective parallel processors; the purpose is to supply a speed-up over sequential implementations of the images operations involved, and the ensuing software program should be considered as a subset of the applying suites of the suitable parallel machines. A literature evaluation and a quick description of the architectures thought of provide an advent into the sector. so much algorithms are constantly offered in an informally outlined extension of the Occam language which include unmarried guideline a number of info flow (SIMD) info kinds and operations on them. unique tools for polygon rendering - together with the operations of filling, hidden floor removal and tender shading - are awarded for SIMD architectures just like the DAP and for a dual-paradigm (SIMD-MIMD) desktop built out of a DAP-like processor array and a transputer community. Polygon clipping algorithms for either transputer and the DAP are defined and contrasted. except the data awarded within the booklet and the precious literature survey, the reader may also anticipate to realize an perception into the programming of the correct parallel machines.
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Additional info for Algorithms for Parallel Polygon Rendering
E. The method is applicable to convex polygons that occupy an a region in which any pixel can be reached from any other by a sequence of any of the eight one-pixel vertical, horizontal or diagonal moves. Given the U O V E t L M A S K for a particular RW, it is usually possible to decide whether its neighbouring windows are RW's by inspecting the appropriate boundary of the C O V E R . 4). For example if the left boundary of the C O V E I L M A S K for a window does not contain window can not be an RW.
I n c r e m e n t a l The Hidden calculations smooth shading for Surface Elimination hidden (SS) for surface planar based on linear interpolations. 2) are both I--ISE varies the z variable of a plane in X Y Z space while variables of (R,G and B standing for three planes in XYR, XYG and XYB the Red, Green and Blue colour components). spaces The solution to one of the two problems implies a solution to the other. The space perspective transformation is chosen so [Newm79]. 2) which can be expressed as a linear function of x and y when solved for z: Z(x,y) where A = - a l e , = Ax + By and C = - d l e .
This identifies the pixels of the window that are actually covered by the polygon. The result is an N × N planar Boolean, C O V E R . M A S K , which identifies the pixels of the window covered by the polygon. The determination of the polygon's extent requires no more than 4 comparisons and 2 34 assignments per vertex and can be performed within the same loop as the calculation of the linear coefficients of the edges (see below). We shall now describe how to find the intersection of the n half planes within each window of the extent.
Algorithms for Parallel Polygon Rendering by Theoharis Theoharis