Rendering the structural color of natural objects or modern industrial products in the 3D environment is not possible with RGB-based graphics platforms and software and very time consuming, even withthe most efficien...
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ISBN:
(纸本)354035638X
Rendering the structural color of natural objects or modern industrial products in the 3D environment is not possible with RGB-based graphics platforms and software and very time consuming, even withthe most efficient spectra representation based methods previously proposed. Our framework allows computing full spectra light object interactions only when it is needed, i.e. for the part of the scene that requires simulating special spectra sensitive phenomena. Achieving the rendering of complex scenes with boththe full spectra and RGB light and object interactions in a ray-tracer costs only some additional fractions of seconds. To prove the efficiency of our framework, we implemented a "Multilayer Film" in a simple ray-tracer. However, the framework is convenient for any complex lighting model, including diffraction or fluorescence.
this paper presents an algorithm for interpolating curves with predefined cross curvature on subdivision surfaces using polygonal complexes. the cross curvature is defined by a separate 2-D polygon which can be used t...
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ISBN:
(纸本)354035638X
this paper presents an algorithm for interpolating curves with predefined cross curvature on subdivision surfaces using polygonal complexes. the cross curvature is defined by a separate 2-D polygon which can be used to generate a complex along the control path. A straightforward application is the generation of Catmull-Clark subdivision surfaces that flow nicely along feature curves. Interactive manipulation of the 2-D polygon will correspond to a variety of features along the interpolated curves such as ribs, bumps, cavities, or even sharp creases.
Simulating realistic lighting and rendering complex scenes are usually considered separate problems with incompatible solutions. Accurate lighting calculations are typically performed using ray tracing algorithms, whi...
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the objective of metafile compositing is to retrieve multi-layered Windows Metafile command records from a picture file and translate them into a set of closed contours in a single layer that delineates a set of conti...
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ISBN:
(纸本)354035638X
the objective of metafile compositing is to retrieve multi-layered Windows Metafile command records from a picture file and translate them into a set of closed contours in a single layer that delineates a set of contiguous non-overlapping regions. Such processing is useful for a variety of engineering applications including vector graphic compression and optimization which is discussed here. Primary concerns here are the multitude of degeneracies that exist when implementing a geometric algorithm of this nature. these issues are left largely unaddressed in previous literature but can be of substantial importance when attempting to develop a robust implementation.
the proceedings contain 75 papers. the topics discussed include: Wang-tiles for the simulation and visualization of plant competition;multi-layered stack mosaic with rotatable objects;skeleton-based shape deformation ...
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ISBN:
(纸本)354035638X
the proceedings contain 75 papers. the topics discussed include: Wang-tiles for the simulation and visualization of plant competition;multi-layered stack mosaic with rotatable objects;skeleton-based shape deformation using simplex transformations;skeleton-driven animation transfer based on consistent volume parameterization;sketch based mesh fusion;real-time rendering of point based water surfaces;controllable multi-phase smoke with Lagrangian particles;an approximate image-space approach for real-time rendering of deformable translucent objects;a novel data hiding algorithm using normal vectors of 3D model;shape matching based on fully automatic face detection on triangular meshes;skin color analysis in HSV color space and rendering with fine scale skin structure;and comprehending and transferring facial expression facial expression based on statistical shape and texture models.
there has been a lot of progress in modeling and rendering elements of our Natural World for computergraphics tasks. In the Plant Kingdom, techniques for modeling the visual patterns presented in many natural objects...
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Refactoring is a widely accepted and daily used technique to enrich the software structure. However, applying refactorings in a distributed environment, where whole groups of people cooperate, there is still a need of...
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ISBN:
(纸本)0889865744
Refactoring is a widely accepted and daily used technique to enrich the software structure. However, applying refactorings in a distributed environment, where whole groups of people cooperate, there is still a need of a better mechanism allowing to merge the changes introduced by developers. In this paper we propose a core for environment, which will help us to defeat and significantly decrease problems of refactoring conflicts. Formally we use graph grammars and graph transformations (edNLC approach) to deal withthe structure of the software and the software refactoring problem.
In virtual colonoscopy, it is crucial to generate the camera path rapidly and accurately. Most of the existing path generation methods are computationally expensive since they require a lengthy preprocessing step and ...
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ISBN:
(纸本)354035638X
In virtual colonoscopy, it is crucial to generate the camera path rapidly and accurately. Most of the existing path generation methods are computationally expensive since they require a lengthy preprocessing step and the 3D positions of all path points should be generated. In this paper, we propose a visibility-based automatic path generation method by emulating the ray propagation through the conduit of the colon. the proposed method does not require any preliminary data preprocessing steps, and it also dramatically reduces the number of points needed to represent the camera path using control points. the result is a perceivable increase in computational efficiency and easier colon navigation withthe same level of accuracy.
the proceedings contain 18 papers. the topics discussed include: XR collaboration architecture based on decentralized web;enhancing the AR experience with machine learning services;calibDB: enabling web based computer...
ISBN:
(纸本)9781450367981
the proceedings contain 18 papers. the topics discussed include: XR collaboration architecture based on decentralized web;enhancing the AR experience with machine learning services;calibDB: enabling web based computer vision through on-the-fly camera calibration;3D point cloud compression: a survey;web-enabled intelligent system for continuous sensor data processing and visualization;project ***: reconstructing a live mirrored world with geotagged social media;a practical approach to integrating live 2D web content withthe immersive web;an online collaborative ecosystem for educational computergraphics;and progressive ray-casting volume rendering with WebGL for visual assessment of air void distribution in quality control.
there are a number of applications in computergraphics and computer vision that require the accurate estimation of normal vectors at arbitrary vertices on a mesh surface. One common way to obtain a vertex normal over...
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ISBN:
(纸本)354035638X
there are a number of applications in computergraphics and computer vision that require the accurate estimation of normal vectors at arbitrary vertices on a mesh surface. One common way to obtain a vertex normal over such models is to compute it as a weighted sum of the normals of facets sharing that vertex. But numerical tests and asymptotic analysis indicate that these proposed weighted average algorithms for vertex normal computation are all linear approximations. An open question proposed in [CAGD,17.-521-543, 2000] is to find a linear combination scheme of the normals of the triangular faces, based on geometric considerations, that is quadratic convergence in the general mesh case. In this paper, we answer this question in general triangular mesh case. When tested on a few random mesh with valence 4, the scheme proposed by this paper is of second order accuracy, while the existing schemes only provide first order accuracy.
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