J. Gain. Virtual sculpting: An investigation of directly manipulated free-form deformation in a virtual environment. Master's thesis, Rhodes University, South Africa, February 1996.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....either an underdetermined or overdetermined system of nonlinear equations, depending on the number of vertices and the total number of control points. Standard solution methods employ either naive pseudo inverses or Householder s QR factorization. For details on solving these equations, refer to [25, 26]. A more important aspect of DMFFD is how it can be used as a retargeting layer as mentioned earlier in Section 3. Since most physically based controllers manipulate the mesh directly, DMFFD is the best method by which the output of a physically based controller can be retargeted to controlling ....

J. Gain, Virtual Sculpting: An Investigation of Directly Manipulated Free-Form Deformation in a Virtual Environment. Masters Thesis, Rhodes University. February 1996.

....Analysis Avatar Movement (rotation and translation) Expression Generation Network Encoding Expression Management Audio Capture Decoding to be computationally expensive and has been avoided for our purposes. For a more complete discussion on traditional FFD issues, refer to [6]; Vertex Interpolation these algorithms simulate the complexities of traditional FFD algorithms by moving vertices without actually introducing new vertices to the geometry. Vertex interpolation enables us to deform an object in real time. 3 Background and Related Work Research into the ....

Gain, J. "Virtual Sculpting: An Investigation of Directly Manipulated Free-Form Deformation in a Virtual Environment". MSc Thesis, Department of Computer Science, Rhodes University, 1996.

....solid modelling at one end, and free form solid modelling at the other [Miller 1986] The main idea behind functional solid modelling is the requirement of a wide range of extremely precise information. On the other hand, in free from modelling only the aesthetics of the final shape matters [Gain 1996]. 1.2. Solid versus Surface Models [Foley et al. 1993] describes a model in general as a representation of some (not necessarily all) features of a concrete or abstract entity. The purpose of a model of an entity is to allow people to visualize and understand the structure or behaviour of the ....

....give the position and orientation of a sensor in space. These eliminate any need for mechanical linkages or sonic, laser or optical sensors, making the device easier to use. One such device is the Polhemus 3Space system. This is the input device chosen for this project. 1.4. Virtual Reality As [Gain 1996] states, there are many definitions of a Virtual Reality (VR) system. However, a term that seems to be present in all of them is interaction (the environment responds to the actions of the user in real time) Since one of the aims of VR is to simulate reality, users usually interact with the VR ....

[Article contains additional citation context not shown here]

Gain J. (1996) Virtual Sculpting: An Investigation of Directly Manipulated FreeForm Deformation in a Virtual Environment, MSc Thesis, Rhodes University. http://cs.ru.ac.za/vrsig/techdocs.html

....Bzier patch) in an initial parallelepiped configuration to demarcate a deformable portion of world co ordinate space. This has since been generalized to hyperpatches on different bases [13, 8, 17] and with generalized topologies [6, 18] FFD has also found widespread application in modelling [14, 8, 11] and animation [5, 7, 16] In all of these, deformation is controlled by repositioning control points (much as in curve and surface design) Unfortunately, this interface is cumbersome and counter intuitive [15] as display of the lattice (control points connected in a grid) tends to clutter the ....

J. Gain. Virtual sculpting: An investigation of directly manipulated free-form deformation in a virtual environment. Master's thesis, Rhodes University, South Africa, February 1996.

....Bezier patch) in an initial parallelepiped configuration to demarcate a deformable portion of world co ordinate space. This has since been generalized to hyperpatches on different bases [12, 8, 16] and with generalized topologies [6, 17] FFD has also found widespread application in modelling [13, 8, 11] and animation [5, 7, 15] In all of these, deformation is controlled by repositioning control points (much as in curve and surface design) Unfortunately, this interface is cumbersome and counter intuitive [14] as display of the lattice (control points connected in a grid) tends to clutter the ....

J. Gain. Virtual sculpting: An investigation of directly manipulated free-form deformation in a virtual environment. Master's thesis, Rhodes University, South Africa, February 1996.

....ffl A scripting language would be helpful in specifying startup conditions such as the type and initial distribution of modules and the shape, position and orientation of objects. ffl Further applications are needed to stringently test the RhoVeR system. There is ongoing work into Solid Modelling [Gain 1996] and Gesture Recognition in this regard. 10 Conclusion This paper has discussed four key facets of the RhoVeR (Rhodes Virtual Reality) System: the control mechanism, parallelism, data distribution, and performance issues. ffl The control sections of RhoVeR allow the assembly of VR objects into ....

Gain, J., Virtual Sculpting: An Investigation of Directly Manipulated Free-Form Deformation in a Virtual Environment, Msc Thesis, Department of Computer Science, February 1996.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC