Selective Mesh Refinement For Rendering

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Selective Mesh Refinement For Rendering

Selective Mesh Refinement For Rendering written by Peter J. C. Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Computer graphics categories.

Selective Mesh Refinement For Interactive Terrain Rendering

Selective Mesh Refinement For Interactive Terrain Rendering written by Peter J. C. Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Computer graphics categories.

Abstract: "Terrain surfaces are often approximated by geometric meshes to permit efficient rendering. This paper describes how the complexity of an approximating irregular mesh can be varied across its domain in order to minimise the number of displayed facets while ensuring that the rendered surface meets pre-determined resolution requirements. We first present a generalised scheme to represent a mesh over a continuous range of resolutions using the output from conventional single-resolution approximation methods. We then describe an algorithm wich extracts a surface from this representation such that the resolution of the surface is enhanced only in specific areas of interest. We prove that the extracted surface is complete, minimal, satisfies the given resolution constraints and meets the Delaunay triangulation criterion if possible. In addition, we present a method of performing smooth visual transitions between selectively-refined meshes to permit efficient animation of a terrain scene."

Selective Mesh Refinement For Rendering

Selective Mesh Refinement For Rendering written by Peter John Cameron Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

Selective Mesh Refinement For Rendering

Selective Mesh Refinement For Rendering written by P. J. C. Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

Enhanced Spatial Deformation For Virtual Sculpting

Enhanced Spatial Deformation For Virtual Sculpting written by James Edward Gain and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Computer graphics categories.

Abstract: "The task of computer-based free-form shape design is fraught with practical and conceptual difficulties. Incorporating elements of traditional clay sculpting has long been recognised as a means of shielding a user from the complexities inherent in this form of modelling. The premise is to deform a mathematically-defined solid in a fashion that loosely simulates the physical moulding of an inelastic substance, such as modelling clay or silicone putty. Virtual sculpting combines this emulation of clay sculpting with interactive feedback. Spatial deformations are a class of powerful modelling techniques well suited to virtual sculpting. They indirectly reshape an object by warping the surrounding space. This is analogous to embedding a flexible shape within a lump of jelly and then causing distortions by flexing the jelly. The user controls spatial deformations by manipulating points, curves or a volumetric hyperpatch. Directly Manipulated Free-Form Deformation (DMFFD), in particular, merges the hyperpatch- and point-based approaches and allows the user to pick and drag object points directly. This thesis embodies four enhancements to the versatility and validity of spatial deformation: 1. We enable users to specify deformations by manipulating the normal vector and tangent plane at a point. A first derivative frame can be tilted, twisted and scaled to cause a corresponding distortion in both the ambient space and inset object. This enhanced control is accomplished by extending previous work on bivariate surfaces to trivariate hyperpatches. 2. We extend DMFFD to enable curve manipulation by exploiting functional composition and degree reduction. Although the resulting curve-composed DMFFD introduces some modest and bounded approximation, it is superior to previous curve-based schemes in other repects. Our technique combines all three forms of spatial deformation (hyperpatch, point and curve), can maintain any desired degree of derivative continuity, is amenable to the automatic detection and prevention of self-intersection, and achieves interactive update rates over the entire deformation cycle. 3. The approximation quality of a polygon-mesh object frequently degrades under spatial deformation to become either oversaturated or undersaturated with polygons. We have devised an efficient adaptive mesh refinement and decimation scheme. Our novel contributions include: incorporating fully symmetrical decimation, reducing the computation cost of the refinement/decimation trigger, catering for boundary and crease edges, and dealing with sampling problems. 4. The potential self-intersection of an object is a serious weakness in spatial deformation. We have developed a variant of DMFFD which guards against self-intersection by subdividing manipulations into injective (one-to-one) mappings. This depends on three novel contributions: analytic conditions for identifying self-intersection, and two injectivity tests (one exact but computationally costly and the other approximate but efficient)."

Proceedings

Proceedings written by Benjamin Watson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Proceedings Of The Ieee Conference On Visualization

Proceedings Of The Ieee Conference On Visualization written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Computer graphics categories.

Multiresolution Tetrahedral Meshes For Scientific Visualization

Multiresolution Tetrahedral Meshes For Scientific Visualization written by Benjamin F. Gregorski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Proceedings

Proceedings written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Computer graphics categories.

Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards

Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Dissertations, Academic categories.