📄 http:^^www.cs.bu.edu^faculty^sclaroff^courses^cs480-96^p4^program4.html
字号:
Date: Tue, 14 Jan 1997 23:02:01 GMTServer: NCSA/1.5Content-type: text/html <HTML> <HEAD><TITLE>BU CAS CS 480: Introduction to Computer Graphics---Programming Assignment 4 </TITLE></HEAD> <BODY> <H2> <!WA0><A href="http://web.bu.edu/pagetwo.html">BU</A>CAS <!WA1><A href="http://cs-pub.bu.edu/">CS</A> 480<p> <!WA2><A href="http://www.cs.bu.edu/faculty/sclaroff/courses/cs480-96/Home.html">Introduction to Computer Graphics</A><p>Spring 1996 </H2> <H2>Programming Assignment 4:<br> Shaded Display of Superquadric Toroids<p>Due before class on Tuesday April 9 </H2> <HR>The purpose of the assignment is to introduce you to 1) polygonal surfacegeneration, 2) basic 3-D shaded display in OpenGL, and 3) camera modeling.<p><h3>The Program You Write</h3>Write a program that allows the user to create and display a superquadrictoroid (donut) in 3-D with shading. <p> <UL> <LI>Allow the user to modify the toroid's two exponents, the three radii,and the hole radius. You may also want to allow the user to vary thenumber of polygons used to approximate the torus. <p><li>Allow the user to modify the camera viewpoint to front, back, top,bottom, left, and right views. In addition, make it possible torotate and position the object in 3-D. To make things easier, centeryou may want to put your toroid at the world coordinate systemorigin.<p><li>Create an animation by defining a camera trajectory, and ``fly by'' amodel created with your toroid(s). During the fly-by, the cameramotion should be smooth and remain pointed at the center of thescene.<p></ul><h3> Parametric Surface and Normal Functions </h3>Given the following equations: <p><em>c(w,m) = SGN(cos(w))*pow(fabs(cos(w)),m)</em><br><em>s(w,m) = SGN(sin(w))*pow(fabs(sin(w)),m)</em><p>where <em>SGN(x)</em> = -1, 0, or 1, depending on whether <em>x</em>is less than, equal, or greater than 0. Suggestion: <em>SGN(x)</em> can beimplemented as a C macro.<p>Points on the surface of a superquadric toroid can becomputed with the following parametric equations:<p><em>x(u,v) = rx*(r + c(u,e1))*c(v,e2)</em><br><em>y(u,v) = ry*(r + c(u,e1))*s(v,e2)</em><br><em>z(u,v) = rz*s(u,e1)</em><p>where: <p><em>rx, ry, rz</em> are the radii,<br><em>r</em> is the hole's radius,<br><em>e1, e2</em> are the superquadric exponents,<br><em>u, v</em> are the surface parameters, both in the range -PI to PI.<p>Normals on the surface of a superquadric toroid canbe computed with the following equations:<p><em>nx(u,v) = (1.0/rx)*c(u,2-e1)*c(v,2-e2)</em><br><em>ny(u,v) = (1.0/ry)*c(u,2-e1)*s(v,2-e2)</em><br><em>nz(u,v) = (1.0/rz)*s(u,2-e1)</em><p><h3>Example Program</h3>Example source files for a simple programthat generates a shaded display of a "regular" torus areavailable in <bf>~cs480/courseware/p4</bf> on the CGLcluster.<p>This example program was adapted from "The OpenGL Programming Guide."This program is only provided as an example and you are not requiredto use it as basis for your own program.<p><h3>Demos and Grading</h3>Your project must run on the SGI, therefore you will needto use one of the SGI workstations in the CGL cluster (unless you haveaccess to an OpenGL elsewhere). <p>Your program's source files are to be electronically submitted by using the <!WA3><Ahref="http://www.cs.bu.edu/faculty/sclaroff/courses/cs480-96/submit.html">submit</a> program on cgl. The code you submitshould conform with the <!WA4><A href="http://www.cs.bu.edu/faculty/sclaroff/courses/cs480-96/guidelines.html">program assignmentguidelines.</a><p>Part of your grade for this programming assignment will be based onyour giving a short demo (2-3 minutes) in the CGL cluster. You willbe expected to talk about how your program works, and we will seehow well your program performs on some test examples. Demos will bescheduled for the Friday afternoon following the assignment due date.<p><blink>Start programming early.</blink><p><h3>Extra Credit</h3>Compute a procedural texture map using fractal techniques and apply itto your toroid. Allow the user to toggle whether a texture map isused or not.<p><h3>Test Cases </h3>You are responsible for testing your own code. <pre><hr>Page Created: <EM>Feb 23, 1996</EM> Last Modified: <em>Feb 23, 1996</em>Maintained by: <!WA5><A href ="http://www.cs.bu.edu/faculty/sclaroff/Home.html"><EM>Stan Sclaroff</EM></A><br></pre> </BODY> </HTML>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -