A web based interactive environment specially for Engineering graphics education is proposed, which provides a virtual collaborative education platform for geographically distributed teachers and students. the system ...
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ISBN:
(纸本)9781586036874
A web based interactive environment specially for Engineering graphics education is proposed, which provides a virtual collaborative education platform for geographically distributed teachers and students. the system of B/S (browser/server) mode, different from general netmeeting program, can make a vectorgraph of DWG format show on clients' browsers online synchronously. And then the graphics can be discussed by modifying the objects or putting designed marks on it, as if on a sheet of blueprint. the updated objects by a user can show on the others' browsers immediately. the users can also talk and listen to each other to express their own opinions. In the system the users are organized in different groups according to respective interested topics. In a group there is a controller and the control power can be transferred among the members. the system serves as a bridge between students and teachers for their extracurricular activities. Withthe tool the student can give his/her haze on browser and ask for help or choose their desired teacher to give some advice, while the teacher can correct student's schoolwork on their own browser. When the schoolwork is checked and corrected, no suspicion of its version is needed to have, the original drawing remains intact and the subsequent external marks are saved in different file respectively. Once the teacher wants to disabuse and give his instructions to one or some students he should only declare or inform them to come to the website at same time and no necessary to come to classroom. Now it has integrated together with a self developed Web based Engineering graphics courseware and a praxis system into a complete web based engineering education system.
Watermarking has been used for protecting the copiright information in various data such as audio signals, images and video. Copiright protection of graphical objects and models is important for protecting author righ...
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Watermarking has been used for protecting the copyright information in various data such as audio signals, images and video. Copyright protection of graphical objects and models is important for protecting author righ...
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Watermarking has been used for protecting the copyright information in various data such as audio signals, images and video. Copyright protection of graphical objects and models is important for protecting author rights in animation, multimedia, computer-aideddesign (cad), virtual reality, medical imaging, etc. Watermarking techniques in 3D graphical objects are facing new challenges because of the specific nature of the information available in 3D graphics. In this paper we suggest a blind watermarking algorithm for 3D models and objects. A string of bits is embedded in the geometrical structure of the graphical object by changing the locations of certain vertices. the criterion employed for selecting the vertices ensures a minimal visibility of the distortion in the watermarked object. the proposed 3D graphical object algorithm is applied in various 3D graphical models including characters and industrial objects.
Registration and integration of measured shape data of real objects are important for 3-D modeling for computergraphics and computer-aideddesign. We propose a new algorithm that solves registration and integration o...
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ISBN:
(纸本)0818685123
Registration and integration of measured shape data of real objects are important for 3-D modeling for computergraphics and computer-aideddesign. We propose a new algorithm that solves registration and integration of multiple range images in a unified framework. the closest point of an object from a general 3-D point can be determined uniquely. If we have range images of an object and the images are registered correctly, the closest points Sound on the range images should be matched except for the case where the part is not measured. We register multiple range images by minimizing the error function determined by the variance of the closest points from every point in the 3-D volume surrounding the object. We introduce scale factors to control the detail of the shape to be considered. the result contains the information of the closest point on the integrated shape: from which we can determine the distance and surface normal to the object. We experimented this method on synthetic and measured range images.
the proceedings contains 24 papers. Topics discussed include visual human algorithms, virtual reality, kinematic clones, ray tracing, image morphing, control rendering, computational geometry, image synthesis, three d...
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the proceedings contains 24 papers. Topics discussed include visual human algorithms, virtual reality, kinematic clones, ray tracing, image morphing, control rendering, computational geometry, image synthesis, three dimensional modeling, computeraideddesign.
Modeling of the occlusal surface of teeth is an important problem in computer-aideddesign of dental restorations. the designed shape must fit the existing jaw articulation. Also, the design process must be fast to be...
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Modeling of the occlusal surface of teeth is an important problem in computer-aideddesign of dental restorations. the designed shape must fit the existing jaw articulation. Also, the design process must be fast to be practical in clinical applications. In this paper we present techniques for automatic adjustment of the occlusal surface of restorations based on the results of articulation simulation. the shape of restorations is changed to avoid interpenetrations withthe opponent teeth during functional jaw movements. the 3-D space mapping method is used which guarantees the surface smoothness and preservation of the main topological features of the occlusal surface. To speedup calculations we use rasterizing graphics hardware for computationally involved collision detection between complex surfaces of teeth.
In the process of car body design, various surfaces can be generated from the given boundary curves. Depending upon the method of the surface generation and the quality of the boundary curves provided, the resulting s...
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ISBN:
(纸本)0818675187
In the process of car body design, various surfaces can be generated from the given boundary curves. Depending upon the method of the surface generation and the quality of the boundary curves provided, the resulting surfaces may have global or local irregularities in many cases. thus it would be necessary for the designer to evaluate the surface quality and to modify the surface or to use the different generation method based upon the evaluation results. this capability is very important because the defect of the surface quality detected in the production stage will require the rework on the dies and will cause a big loss in money and time. In this paper, two types of interrogation methods for the assessment of shape quality are described. One is the reflection mapping, which simulates the reflection test on the real part in the production line. this method is useful for detecting global irregularities of a surface. the other is the visualization of the curvature behavior of a surface. the method consists of traditional focal analysis, which exaggerates the mean, Gaussian and strain energy of curvature. this method makes it easier to detect local irregularities.
Planing of facial surgery by using computeraideddesign is an usable tool. A computer skull model for a patient can be produced in order to simulate various treatment options.
Planing of facial surgery by using computeraideddesign is an usable tool. A computer skull model for a patient can be produced in order to simulate various treatment options.
this book constitutes the refereed proceedings of the 16thinternationalconference on computer-aided Architectural design Futures, CAAD Futures 2015, held in São Paulo, Brazil, in July 2015. the 33 revised full ...
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ISBN:
(数字)9783662473863
ISBN:
(纸本)9783662473856
this book constitutes the refereed proceedings of the 16thinternationalconference on computer-aided Architectural design Futures, CAAD Futures 2015, held in São Paulo, Brazil, in July 2015. the 33 revised full papers presented were carefully reviewed and selected from 200 submissions. the papers are organized in topical sections on modeling, analyzing and simulating the city; sustainability and performance of the built space; automated and parametric design; building information modelling (BIM); fabrication and materiality; shape studies.
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