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1、49Original Paper_ Forma, 21, 4965, 2006Creating a Virtual Wooden Sculpture and a Woodblock Printwith a Pressure Sensitive Pen and a TabletShinji MIZUNO1*, Daigo KOBAYASHI2, Minoru OKADA3,Jun-ichiro TORIWAKI4and Shinji YAMAMOTO51Information and Media Center, Toyohashi University of Technology, Toyoha
2、shi 441-8580, Japan2Department of Knowledge-based Information Engineering, Toyohashi University of Technology,Toyohashi 441-8580, Japan3Graduate School of Information, Production and Systems, Waseda University, Kitakyusyu 808-0135, Japan4School of LifeSystems and Technology, Chukyo University, Toyot
3、a 470-0393, Japan5School of Computer and Congnitive Sciences, Chukyo University, Toyota 470-0393, Japan*E-mail address: mizunoimc.tut.ac.jp(Received January 31, 2005; Accepted June 9, 2005)Keywords: Computer Graphics, Virtual Sculpting and Printing, Interactive, PressureSensitive PenAbstract. In thi
4、s paper, we present an interactive CG creating system with a pressuresensitive pen and a tablet. This system is based on the virtual sculpting and printingmethod which are simulations of the real sculpting and woodblock printing. In the virtualsculpting process, the user operates virtual chisels wit
5、h the pen to sculpt a virtual woodenobject which has a 3D shape. The user can control the carving depth and the carving angleto the surface of the object with the pressure applied to the pen. The system can take thechange in the hardness of wood that originates from grain and the surface shape. In t
6、hevirtual printing process, a woodblock print is generated from woodblocks which arecreated in the virtual sculpting process. The pressure sensitive pen is used to operate aJapanese printing squeegee, Baren (disk-shaped pad). The user can control the thicknessof the print by changing the pressure of
7、 printing operation. It is possible to synthesize arealistic Ukiyo-e print in the same process with the same carving and printing techniquesas creating it in the real world.1. IntroductionRecent progress of computer technology has made computer graphics (CG) morefamiliar to anyone, and the chance th
8、at general people treat CG has been increasing. Thus,CG creating systems which any users can use without special knowledge of computers andCG are required. Adopting the art creating techniques of the real world in the CG systemis one of the most effective solution. It is also useful for synthesizing
9、 non-photorealisticimages, and many art techniques of the real world are used in such systems. Many realcreating methods are simulated in the virtual space such as sculpting and embossing(GALYEAN and HUGHES, 1991; SOURIN, 2001), clay modeling (MASSIE and SALISBURY,50 S. MIZUNOet al.1994; MAENO et al
10、., 2004), painting on a 3D surface (JOHNSON et al., 1999), oil andwatercolor painting with virtual brushes (SAITOH and NAKAJIMA, 1999; BAXTER et al.,2001; XU et al., 2003), pen and ink illustration (SALISBURY et al., 1994), copperplateprinting (TASAKI et al., 2004), and so on.As one of these systems
11、, we have developed the virtual sculpting and printing system(MIZUNO et al., 1999, 2000a, 2000b). This system enables the user to experience and enjoyinteractive sculpting and woodblock printing in the virtual space. Our system aims that ituseful not only for beginners like children but also artists
12、 who have actual techniques ofwooden sculpting and woodblock printing. For the virtual sculpting scheme, we implementedan interactive modeling technique to form a solid object with carved surfaces by carvinga virtual workpiece with a virtual chisel as we do in the real world. We also proposed thevir
13、tual printing scheme that is a method to synthesize a woodblock print by simulating itsreal process. The user creates a monochrome print and a multicolored print like Ukiyo-e byusing virtual items such as woodblocks, a paper sheet, ink, and a Baren (disk-shaped pad)in the system (MIZUNO et al., 2001
14、, 2002).In the former virtual sculpting, the user used a mouse to operated a chisel. It is difficultto give parameters of the carving depth and the carving angle to the surface only with amouse, and it was necessary to input them with the keyboard before carving. It was exactand useful for industria
15、l products, but it was different from real carving operation and notso suitable for artistic works. To solve this problem, other hardware devices which caninput parameters besides a 2D position, such as a 3D mouse or a haptic device are useful(GALYEAN and HUGHES, 1991; MASSIE and SALISBURY, 1994).A
16、pressure sensitive pen and a tablet is one of the most popular pressure sensitivehardware devices, and it is often used for 2D drawing (SAITOH and NAKAJIMA, 1999; XUet al., 2003). In generating a 3D sculpture and a printing woodblock, the chisel mainlymoves in the 2D space with various power. We consider that a pressure sensitive pen anda tablet are suitable for simulating virtual carving operation with chisels in our system(MIZ
