K. T. McDonnell, H. Qin, and R. A. Wlodarczyk. Virtual clay: A real-time sculpting system with haptic toolkits. 2001.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....design sytem that supports geometric modeling and texture painting with a direct 3D interface via force feedback devices. Our system offers 3D texture painting on arbitrary polygonal meshes with the haptic stylus as an electronic paintbrush . Unlike most of the existing haptic sculpting systems [MQW01, RE99, ST99] we use subdivision surfaces as the underlying geometric representation with a physically based force model for deforming the models. The turtle in Figure 1 was created and texture painted by ArtNova. Notice the shell pattern on the back, and the mottling on the legs and face. In ....

.... mathematical framework to hierarchical editing [FB88] subdivision methods allow modeling of arbitrary topology surfaces [SZ98] while supporting multiresolution editing [DKT98, HDD 94, KS99, SZMS98, ZSS97] There are also other sculpting techniques based on volumetric modeling methods [GH91, MQW01, RE99, PF01] The haptic modeling system inTouch uses subdivision surfaces as its underlying geometric representation [GEL00] but it lacks a physically based force model to generate a realistic feedback sensation. 3D Texture Painting: By using standard graphics hardware to map the brush from ....

K. McDonnell, H. Qin, and R. Wlodarczyk. Virtual clay: A real-time sculpting system with haptic interface. Proc. of ACM Symposium on Interactive 3D Graphics, pages 179--190, 2001.

....freeform sculpting using zero sets of scalar trivariate functions [19] Real time visualization of this system is achieved by applying the Marching Cubes algorithm incrementally. McDonnell, Qin, and Wlodarczyk use subdivision solids with a spring network to simulate the semi elasticity of clay [13]. The user can manipulate the clay by several means, including pulling with force feedback using rope tools . Perry and Friskin developed a digital sculpting system, Kizamu, based on Adaptively Sampled Distance Fields (ADFs) a volumetric shape representation [16] Kizamu also exploited hardware ....

....Kizamu, based on Adaptively Sampled Distance Fields (ADFs) a volumetric shape representation [16] Kizamu also exploited hardware to accelerate rendering using either polygon or point primitives. Unlike most of the existing haptic sculpting systems that are based on volumetric representations [13, 16, 19, 20], our modeling system uses subdivision surfaces as the underlying geometric representation with a spring based surface resistance force for deforming the model surfaces. Recently, researchers at Ford have also proposed a similar surface sculpting paradigm by manipulating the control points of ....

K. McDonnell, H. Qin, and R. Wlodarczyk. Virtual clay: A real-time sculpting system with haptic interface. Proc. of ACM Symposium on Interactive 3D Graphics, pages 179--190, 2001.

....the modelling task is carried out in a natural and user friendly way, exactly like during clayworks. Many research works have been carried out on simulation of such deformations using physical laws: Finite Element method [Pen89] Wie97] Deb00] methods based on elasticity theory [Deb00] Ter88] [Don01], particle systems [Ree83] Des96] etc. So far, none of these methods allows real time interaction with the user : they require much too long computation time for complex shapes and are not suitable for human interaction. Some researches are undergoing on volume sculpting in a 3D virtual space. ....

K. T. MCDONNELL, Hong QIN, and R. A. WLO- DARCZYK. Virtual clay: a real-time sculpting system with haptic toolkits. In Symposium on Interactive 3D Graphics, pages 179--190, 2001.

.... is the editing of a model of a human face, the skin is modified by the user but forces due to bone, muscle and tissue structure resist the changes and ensure the modification is in accordance with physical limits [126] Another example is the Virtual Clay system of McDonnell, Qin and Wlodarczyk [79] where forces during sculpting are simulated in real time allowing the creation of virtual sculptures. Many computer graphics techniques have evolved over the years to model deformations [40] These techniques vary from full continuum models for elastic materials, through mass spring particle ....

K.T. McDonnell, H. Qin, and R.A. Wlodarczyk. Virtual clay: A real-time sculpting system with haptic toolkits. In Proc. Symposium on Interactive 3D Graphics, pages 179--190. ACM, Mar 2001.

....designs. Our framework is open and extensible to incorporate advanced painting and paint simulation, as well as combination with sophisticated vision based tracking methods [14, 17] and a deformable object modeler, to produce, for instance, a spatially augmented simulation of sculpting with clay[19]. Medical and Cosmetic. Introducing Spatially Augmented Reality Painting instead of the HMD based systems currently used in medical AR research [3, 29] might seem radical, but if we can track a deformable object (the human body) accurately, we can at least use it for annotation. In cosmetics, ....

K. T. McDonnell, H. Qin, and R. A. Wlodarczyk. Virtual clay : A real-time sculpting system with haptic toolkits. In 2001.

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K. T. McDonnell, H. Qin, and R. A. Wlodarczyk, "Virtual clay: A realtime sculpting system with haptic toolkits," in Proceedings of the 2001.

....A natural extension of the framework to subdivision solids is done by McDonnell and Qin [61] They employed MacCracken and Joy s subdivision solids [57] as the underlying model. They extended their work to include haptic interaction, which enables a user to feel the object in virtual space [62]. Figure 23: Examples of the scenes generated by Virtual Clay. Image courtesy of Kevin T. McDonnell. 29 5.2 Free form Deformation Although interactive modeling through deformable models are considered as a part of freeform deformation (FFD) modeling, we restrict the meaning of global and ....

K. T. McDonnell, H. Qin, and R. A. Wlodarczyk. Virtual clay: A real-time sculpting system with haptic toolkits. In Proceedings of the 2001.

....generating a force to be applied to the finger. Thompson et al. 6] derived efficient intersection techniques that can be applied to nearly any type of haptic interface. Dachille et al. 20] developed a haptic interface to permit the direct manipulation of dynamic surfaces. McDonnell et al. [7] employed haptic toolkits to explore the dynamic subdivision solids. Avila et al. 8] presented a haptic interaction that is suitable for both volume visualization and modeling application. Despite the widespread application of haptics in visual computing areas, hapticsbased interaction was mainly ....

K. T. McDonnell, H. Qin and R. A. Wlodarczyk. Virtual Clay: A real-time sculpting system with Haptic Toolkits. In Proc. of the 2001.

....of some objects sculpted with our system. The head in particular utilized almost every sculpting tool at our disposal. Our novel physics based subdivision model was recently published at the IEEE Computer Animation 2000 Conference [MQ00] and at the 2001 ACM Symposium on Interactive 3D Graphics [MQW01] A full description of the model and simulation loop can be found in those publications, although we will briefly discuss each now. A DYNASOAR is defined first by its control lattice and secondly by its physical attributes. First the control lattice is subdivided to the user specified level. ....

K. T. McDonnell, H. Qin, and R. A. Wlodarczyk. Virtual clay: A real-time sculpting system with haptic toolkits. In Proceedings of the 2001 ACM Symposium on Interactive 3D Graphics, March 2001.

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K. T. McDonnell, H. Qin, and R. A. Wlodarczyk. Virtual clay: A real-time sculpting system with haptic toolkits. 2001.

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McDonnell K.T., Qin H., Wlodarczyk R.A.: Virtual clay: A real-time sculpting system with haptic toolkits. In Proceedings of the 2001 ACMSymposium on Interactive 3D Graphics, 179-190 (2001).

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