{"title":"Cached Geometry Manager for View-dependent LOD Rendering","authors":"R. Lario, R. Pajarola, F. Tirado","doi":"10.5167/UZH-47734","DOIUrl":"https://doi.org/10.5167/UZH-47734","url":null,"abstract":"The new generation of commodity graphics cards with significant on-board video memory has become widely \u0000popular and provides high-performance rendering and flexibility. One of the features to be exploited with this \u0000hardware is the use of the on-board video memory to store geometry information. This strategy significantly \u0000reduces the data transfer overhead from sending geometry data over the (AGP) bus interface from main memory \u0000to the graphics card. However, taking advantage of cached geometry is not a trivial task because the data models \u0000often exceed the memory size of the graphics card. In this paper we present a dynamic Cached Geometry \u0000Manager (CGM) to address this issue. We show how this technique improves the performance of real-time \u0000view-dependent level-of-detail (LOD) selection and rendering algorithms of large data sets. Alternative caching \u0000approaches have been analyzed over two different view-dependent progressive mesh (VDPM) frameworks: one \u0000for rendering of arbitrary manifold 3D meshes, and one for terrain visualization.","PeriodicalId":174516,"journal":{"name":"International Conference in Central Europe on Computer Graphics and Visualization","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134501301","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}
{"title":"Interactive Radial Volume Histogram Stacks for Visualization of Kidneys from CT and MRI.","authors":"M. A. Selver, M. Özdemir, E. Selvi","doi":"10.5072/ZENODO.25610","DOIUrl":"https://doi.org/10.5072/ZENODO.25610","url":null,"abstract":"Optical parameter assignment via Transfer Functions (TF) is the sole interactive part in medical visualization via volume rendering. Being an interactive element of the rendering pipeline, TF specification has very important effects on the quality of volume-rendered medical images. However, TF specification should be supported by informative search spaces, interactive data exploration tools and intuitive user interfaces. Due to the trade-off between user control and TF domain complexity, integrating different features into the TF without losing user interaction is a challenging task since both are needed to fulfill the expectations of a physician. By addressing this problem, we introduce a semi-automatic method for initial generation of TFs. The proposed method extends the concept of recently introduced Volume Histogram Stack (VHS), which is a new domain constructed by aligning the histograms of the image slices of a CT and/or MR series. In this study, the VHS concept is extended by allowing the user to define an alignment axis using orthogonal multi planar reconstructions via simple, yet effective, interaction mechanisms. The construction of VHS according to the slices generated specifically for user defined search space allows the more informative integration of local intensity distribution, and better spatial positioning of the organ of interest into the TF. For testing, the proposed strategy is applied to kidney visualization from CT and MRI series. The performance of extended VHS domain is evaluated via intensity based TF design. Volumetric histogram based manual TF specifications are quantitatively compared to VHS based manual tweaking of original slices, and to extended-VHS based automatic TF design. The results show both quantitatively and qualitatively enhanced rendering quality for kidney visualization.","PeriodicalId":174516,"journal":{"name":"International Conference in Central Europe on Computer Graphics and Visualization","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131355827","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}