1. IRIT Solid Modeler 3D MAP Lab. Joon-Kyung Seong

2. Course TA Name: Joon-Kyung Seong Office: 302, 315-2 Office Hours: Tue., Thu. 9:30-12:30 Class Homepage: http://3map.snu.ac.kr/course/2003/adva nce/main.html

3. Contents Introduction Irit as a Script Language How to install? Irit as a CAGD Library How to implement? Enhancing the results VTK: Graphics Library

4. Introduction Free-form tools in CG and CAGD. Deals with Curves and Surfaces(Bezier or B-spline form) Provide mathematical basis and even some futuristic way of modeling and rendering the real world.

5. Generated by Sagi Schein, Israel

6. Introduction Irit as a solid modeler and as a CAGD library. Most powerful CAGD library in the world. Supports basic operations on the curves and surfaces. (symbolic operations or numeric methods) Developed by Prof. Gershon Elber. (Technion, Israel) Anim

7. How to install? 1. Get a source code www.cs.technion.ac.il/~gershon/temp/irit-sm.zip 2. Compile the source code Unix : makeflag.unx Windows : makeflag.wnt  ‘ make ’, ‘ nmake ’ with ‘ -f ’ option 3. Set environments for IRIT set IRIT_PATH=c:/irit-sm/ntbin/ set IRIT_DISPLAY=wntgdrvs – s- set IRIT_BIN_IPC=1 4. Test Run irit (in DOS window). Type “ include( “ demo.irt ” ); ”

8. Special Linking to Emacs Emacs extension + E : execute one line + h : help on the command + s : command line Usage Install emacs Copy the file ‘ _emacs ’ to C:\

9. Irit as a script language You can model and render the real world with some amounts of work.

10. Irit as a script language Interpret command line by line. Grammar of the language is similar to C language. Example : teapot.irt Should refer user ’ s manual (www.cs.technion.ac.il/~irit/user_man.ht ml.index.html)

11. Irit as a script language Generate Animation easily.

12. Irit as a script language How to generate an animation in irit script? Create a animation curve Example: snake puzzle Animation with POV-Ray Generate a sequence of data files using irit Irit2pov Render using POV-Ray

13. Irit as a CAGD Library Supports almost every basic operations on the Free-form domain. Link and call the library in your C/C++ project. Programmer ’ s manual: (www.cs.technion.ac.il/~irit/prog_man.ht ml)

14. Implementation Examples Simple Surface/Surface Intersection 3 equations in 4 variables Multivariate Solver in Irit

15. Implementation Examples (Ringed-Ringed Intersection)

16. Implementation Examples (Convex Hull)

18. Enhancing the Results Make a ps file Command : irit2ps ( dat  ps ) Enhancing reality : illustrt – simple line illustration filter Eg : illustrt – f 0 512 – l 0.01 – t 0.01 eg.mat eg.dat|irit2ps – d – 0.8 0.2 – u -> eg.ps Make a rendered image Command : irender ( dat  ppm, rle ) Eg : irender – s 700 700 – M Flat – b 255 255 255 – A sync – i rle eg.mat eg.dat > eg.rle

19. VTK Object Oriented Language C++/Tcl Visualization Tookit