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Date: Mon, 16 Dec 1996 22:11:34 GMTServer: NCSA/1.5Content-type: text/htmlLast-modified: Fri, 01 Mar 1996 15:08:15 GMTContent-length: 7367<html><head><title>CS418 Lab 3</title></head><body><h2> <!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><img src="http://www.tc.cornell.edu/Visualization/Education/cs418/gifs/teapot.thumb.gif">CS 418: Laboratory 3 </h2> <h2> Transformations and Modeling</h2><b> Introduction. </b><br>This exercise introduces the processes of geometricallytransforming an object in size, orientation, and location, then combiningobjects to make a complex scene.There are several example programs given below to show you how tocombine objects and animate them. Based on these examples, you will be askedto construct a short animation.<b><hr>Procedure:</b><p>First you may want to download several example files. To do this, click oneach of the filenames shown below. When the text window opens, use the"save as" option to put the file in your own directory. Name each file withthe same name as shown below. If you decide not to look at all of them, youmay load them in pairs of *.net and *.cfg.The program polyhedra-unit.net reads a data file polyhedra-unit.dx. You will needto change the path name in the Import module in the program to reflect thedirectory in which you copy polyhedra-unit.dx.<b> The programs windmill.net and cubeflake.net also require the data file polyhedra-unit.dx.</b><ul><li> <!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/transform.net"> transform.net </a><li> <!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/transform.cfg"> transform.cfg </a><p><li> <!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/windmill.net"> windmill.net </a><li> <!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/windmill.cfg"> windmill.cfg </a><p><li> <!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/cubeflake.net"> cubeflake.net </a><li> <!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/cubeflake.cfg"> cubeflake.cfg </a><p><li> <!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/rose.net"> rose.net </a><li> <!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/rose.cfg"> rose.cfg </a><p><li> <!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/polyhedra-unit.net"> polyhedra-unit.net </a><li> <!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/polyhedra-unit.cfg"> polyhedra-unit.cfg </a><li> <!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/polyhedra-unit.dx"> polyhedra-unit.dx </a></ul><p>The first program is an example which shows how to scale, rotate andtranslate an object. Open the program transform.net and it's control paneland execute it while changing the rotation, translation, and scalingof the simple object (see <!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><a href="#IM1">Image 1</a>). The program also allows you to select whether thetranslate control transforms the object before the scaling and rotation orafter them. Note that as you rotate the object, that a positive angle ofrotation corresponds to counterclockwise rotation if you are looking downthe positive axis of rotation toward [0,0,0]. The object is defined tohave the base of the arrows at [0,0,0] so that the scale operationmagnifies the objects, but does not move the base. Likewise, the rotateoperation (which rotates around the origin) leaves the base at the originif translation is performed last. Investigate the effects of changing theorder of the rotate, translate, and scaling operations by using theoperation order control and by modifying the program module order.<h4><a name = "IM1"><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><img align=bottom src="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/labgifs/transform.1.gif"> Image 1</h4><p>The second program, windmill.net, is an example of a hierarchically modelled, animatedobject (see <!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><a href="#IM2">Image 2</a>). The object is a windmill constructed from a propellor and a tower.The propellor, in turn, is make up of two blades, a hub and a shaft. Openthe sequencer and run the program. The QuadricSurface module gereratesspheres, cylinders, and other shapes. The shape is set by an integer. Theshape list may be found by double- clicking the QuadricSurface module, thenclicking on the "Description..." button. The import module reads thevertex list of a cube from polyhedra-unit.dx. Edit the file to see whatelse is there. Rotation of the whole tower is controlled by a computemodule with a conditional in it to delay rotation.<h4><a name = "IM2"><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><img align=bottom src="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/labgifs/windmill.1.gif"> Image 2</h4><p>The third example program, cubeflake.net, combines polyhedra to make an interesting object(see <!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><a href="#IM3">Image 3</a>).Open the control panel and run the program using the sequencer. Note howmultiple copies of objects are positioned.<h4> <a name = "IM3"><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><img align=bottom src="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/labgifs/cubeflake.1.gif"> Image 3 </h4><p>Other Lab 3 demonstration nets: polyhedra-unit.net (see <!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><a href="#IM4">Image 4</a>), rose.net (see <!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><a href="#IM5">Image 5</a>). <br><h4><a name="IM4"><p><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><img align=bottom src="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/labgifs/polyhedraunit.1.gif"> Image 4 <a name="IM5"><p><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><img align=bottom src="http://www.tc.cornell.edu/Visualization/Education/cs418/labs/labgifs/rose.image.gif"> Image 5 </h4><b> <hr> Assignment:</b><p>Using the three example programs as background, construct one of theobjects described below. Use the various modules in the "macros" categorywhich produce shapes, such as NewQuadricSurface. Also use the shapes definedin the polyhedra-unit.dx file. Animate the resulting objects as specified.The animation should be 20 to 100 frames in length. A small Image window size(perhaps 320x240) will speed execution.<p>Construct <b> one </b> of:<ol><li> A helicopter with fuselage, tail, skids, main rotor and tail rotor.The tail rotorshould rotate twice as fast as the main rotor. The helicopter should siton the grounduntil the blades are spinning, then fly straight up.<li> A propellor airplane on which the propellors rotate at the same rate.The planeshould have wings, tail, engines, and a cockpit canopy. The plane shouldsit on theground until the blades are spinning then roll forward and up.<li> A flowering plant with stem, leaves, and flower. The plant should grow and bloom. The flower should be constructed from severalpetals. There must be at least two leaves on the plant.<li> A robot with a head, body, arm(s) and at least two wheels. The robotmust roll forward, stop, grasp an object and move it. The head must haveeyes (or cameras) which move together.<li> A bird landing on a tree. The bird must have wings, head, eyes, beak andfeet. The wings must flap and the feet must move as the bird lands.</ol><p><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/student.1995.gifs/lab3.95results.html">Some examples from 1995.</a><p><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/student.1996.gifs/lab3.96results.html">Some examples from 1996.</a><p> Be prepared to demo your animation during section for a maximum of 15minutes. You will be graded on the correctness of the animation and thereadability of the program. You may want to <!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/MPEG/mpeg.html"> MPEG compress </a> your animationfor rapid playback, or if you wish to submit it to the course web pages.<p><b>You must document your code!</b> Layout small groups of modules which fit onone screen and connect them to other groups with transmitters. You shoulduse transmitters/receivers, macros, and comments in the "Notation" field ofeach module so that you and the grader can understand the program. Controlpanels, if any, should be well organized, labeled, and with the appropriatenumeric ranges.<p>The<!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/GradeGuides/Lab3.grade.ps"> Lab 3 grading guide </a>will be filled out by a consultant during section to evaluate your work.<p><p><!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><img src="http://www.tc.cornell.edu/Visualization/Education/cs418/gifs/leftarrow.icon.gif">Back to <!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/index.html">Main Page</a><br><!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><img src="http://www.tc.cornell.edu/Visualization/Education/cs418/gifs/rightarrow.icon.gif">Go to <!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><a href="http://www.tc.cornell.edu/Visualization/Education/cs418/lab4.html">Lab 4</a> <P><hr>Last modified, 1/23/96, B. Land. <! Revision history: Original document: P.Maxfield, 10/94><br><!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><IMG SRC="http://www.tc.cornell.edu/copyright.xbm"><!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><A HREF="http://www.tc.cornell.edu/ctcCopyright.html"> <i>Copyright Statement </I></A></body> </html>⌨️ 快捷键说明
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