International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa最新文献_第3页

Virtual reality training applications for the mining industry 虚拟现实培训在采矿业中的应用

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503465

E. V. Wyk, R. D. Villiers

{"title":"Virtual reality training applications for the mining industry","authors":"E. V. Wyk, R. D. Villiers","doi":"10.1145/1503454.1503465","DOIUrl":"https://doi.org/10.1145/1503454.1503465","url":null,"abstract":"Virtual reality is a rapidly growing technology which utilises the ever-increasing power of computers to simulate real-world and imaginary environments and situations with a high degree of realism and interactiveness. Safety in the South African mining industry is a vital issue. On average, one worker dies every working day, and about 16 are injured in mine-related accidents. Inadequate or insufficient training is often cited as a root cause for many mining fatalities. However, training outside the direct working environment provides only limited real-life opportunities and may fail to make a significant impact within the tense working environment itself. Virtual reality-based training tools can, by contrast, provide simulated exposure to real-world working conditions without the associated risks. This paper discusses contextual requirements and constraints for virtual reality application development, applied to safety training in mines. The results of the contextual analysis were applied to the design and development of several prototypes of VR training systems. The paper also reports on how realism can be enhanced in simulation training systems.","PeriodicalId":325699,"journal":{"name":"International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125777133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 140

Associating fonts with musical genres 将字体与音乐类型相关联

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503460

Jukka Holm, Antti Aaltonen, Jarno Seppänen

引用次数: 6

Analytic simplification of animated characters 动画人物的分析简化

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503462

Bruce Merry, P. Marais, J. Gain

{"title":"Analytic simplification of animated characters","authors":"Bruce Merry, P. Marais, J. Gain","doi":"10.1145/1503454.1503462","DOIUrl":"https://doi.org/10.1145/1503454.1503462","url":null,"abstract":"Traditionally, levels of detail (LOD) for animated characters are computed from a single pose. Later techniques refined this approach by considering a set of sample poses and evaluating a more representative error metric. A recent approach to the character animation problem, animation space, provides a framework for measuring error analytically. The work presented here uses the animation-space framework to derive two new techniques to improve the quality of LOD approximations.\u0000 Firstly, we use an animation-space distance metric within a progressive mesh-based LOD scheme, giving results that are reasonable across a range of poses, without requiring that the pose space be sampled.\u0000 Secondly, we simplify individual vertices by reducing the number of bones that influence them, using a constrained least-squares optimisation. This influence simplification is combined with the progressive mesh to form a single stream of simplifications. Influence simplification reduces the geometric error by up to an order of magnitude, and allows models to be simplified further than is possible with only a progressive mesh.\u0000 Quantitative (geometric error metrics) and qualititative (user perceptual) experiements confirm that these new extensions provide significant improvements in quality over traditional, naïve simplification; and while there is naturally some impact on the speed of the off-line simplification process, it is not prohibitive.","PeriodicalId":325699,"journal":{"name":"International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115800737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Simulating crowd phenomena in African markets 模拟非洲市场的人群现象

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503463

F. Tasse, Kevin R. Glass, S. Bangay

引用次数: 6

Visual quality of the ground in 3D models: using color-coded images to blend aerial photos with tiled detail-textures 3D模型中地面的视觉质量:使用彩色编码图像将航空照片与平铺细节纹理混合

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503468

Mattias Roupé, Mikael Johansson

引用次数: 5

Revisiting district six: a case study of digital heritage reconstruction from archival photographs 重访第六区:从档案照片中重建数字遗产的案例研究

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503457

Christopher de Kadt, J. Gain, P. Marais

{"title":"Revisiting district six: a case study of digital heritage reconstruction from archival photographs","authors":"Christopher de Kadt, J. Gain, P. Marais","doi":"10.1145/1503454.1503457","DOIUrl":"https://doi.org/10.1145/1503454.1503457","url":null,"abstract":"This paper investigates the digital reconstruction of destroyed buildings from small sets of old, uncalibrated photographs. The application domain is the heritage preservation of District Six -- a mixed race area in Cape Town that was leveled during the South African Apartheid regime and whose residents were forcibly removed.\u0000 Our framework uses a combination of semi-automatic camera calibration, model-based architecture-specific photogrammetry, and texture synthesis to reconstruct the geometry and texture of a building so that it can be incorporated into a heritage-based virtual environment, such as a museum display. These techniques are well established in isolation; the purpose here is to discover if they can be adapted to damaged and uncalibrated photographs, where the time periods and chromatic schemes differ or where, in the worst case, only a single photograph is available.\u0000 To test the effectiveness of the reconstruction framework we consider three representative cases of District Six architecture. All three cases were reconstructed successfully with some provisos concerning uneven ground, intricate building features, and unfavourable camera angles.","PeriodicalId":325699,"journal":{"name":"International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130760608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Particle-based fluid flow visualization on meshes 网格上基于颗粒的流体流动可视化

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503466

Khalid Djado, R. Egli

引用次数: 2

An efficient parameters estimation method for automatic patch-based texture synthesis 一种有效的基于补丁的纹理自动合成参数估计方法

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2009-02-04 DOI: 10.1145/1503454.1503471

Jakrapong Narkdej, P. Kanongchaiyos

引用次数: 4

Generic computation of bulletin boards into geometric kernels 公告板几何核的通用计算

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2007-10-29 DOI: 10.1145/1294685.1294700

Mehdi Baba-ali, D. Marcheix, Xavier Skapin, Y. Bertrand

{"title":"Generic computation of bulletin boards into geometric kernels","authors":"Mehdi Baba-ali, D. Marcheix, Xavier Skapin, Y. Bertrand","doi":"10.1145/1294685.1294700","DOIUrl":"https://doi.org/10.1145/1294685.1294700","url":null,"abstract":"Nowadays, many commercial CAD systems are built on proprietary geometric kernel which provide an API containing a set of high level geometric operations (boolean operations, slot, chamfering, etc). Because of their complexity, these operations can generate important modifications on topological cells (vertices, edges, faces, volumes, etc.) of the objects. At the same time, many of these kernels need to know precisely what has occurred to each topological cell belonging to objects given or resulting from a previous high level geometric operation. At the end of each operation, the geometric kernel must provide a bulletin board describing cells' evolution through a list of events (split, merge, creation, deletion).\u0000 Most commercial geometric kernels use B-Rep structures and provide methods enabling the developer of a CAD system to retrieve a number of events that occurred on cells. These kernels have their own scheme for detecting events, based on their own taxonomy of situations, heuristics and evolution rules. Little is known of their details, which are proprietary information, let alone of the underlying theory, if any. Generally, for example, the detected events are not generic for all cells' dimensions. This lack of underlying theory limits the possibility to extend the use of these kernels to new domains of investigation.\u0000 In this paper, we propose a generic model that enables to create a bulletin board. This bulletin board will contain the complete list of events having occurred on cells of any dimension, and that belong to any topological model. The genericity of this model and the completeness in all dimensions of this list are based on the use of four elementary mechanisms (split_elem, merge_elem, crea_elem, del_elem). They are defined independently of the topological model, and allow the generation of the bulletin board, whatever the geometric operation. This model has been implemented using the geometric kernel of the modeler Moka, based on generalized maps.","PeriodicalId":325699,"journal":{"name":"International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa","volume":"312 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124288997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A comparison of linear skinning techniques for character animation 角色动画的线性蒙皮技术的比较

International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa Pub Date : 2007-10-29 DOI: 10.1145/1294685.1294715

D. Jacka, Ashley Reid, Bruce Merry, J. Gain

{"title":"A comparison of linear skinning techniques for character animation","authors":"D. Jacka, Ashley Reid, Bruce Merry, J. Gain","doi":"10.1145/1294685.1294715","DOIUrl":"https://doi.org/10.1145/1294685.1294715","url":null,"abstract":"Character animation is the task of moving a complex, artificial character in a life-like manner. A widely used method for character animation involves embedding a simple skeleton within a character model and then animating the character by moving the underlying skeleton. The character's skin is required to move and deform along with the skeleton. Research into this problem has resulted in a number of skinning frameworks. There has, however, been no objective attempt to compare these methods.\u0000 We compare three linear skinning frameworks that are computationally efficient enough to be used for real-time animation: Skeletal Subspace Deformation, Animation Space and Multi-Weight Enveloping. These create a correspondence between the points on a character's skin and the underlying skeleton by means of a number of weights, with more weights providing greater flexibility. The quality of each of the three frameworks is tested by generating the skins for a number of poses for which the ideal skin is known. These generated skin meshes are then compared to the ideal skins using various mesh comparison techniques and human studies are used to determine the effect of any temporal artefacts introduced. We found that Skeletal Subspace Deformation lacks flexibility while Multi-Weight Enveloping is prone to overfitting. Animation Space consistently outperforms the other two frameworks.","PeriodicalId":325699,"journal":{"name":"International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114341174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 36