实景三维模型在铁路工程勘察设计方面应用愈发广泛,但在模型可视化过程中的失真现象和纹理贴图被倾斜摄影测量外业环境限制问题较为突出,严重制约实景三维模型的实际效果和应用范围。通过将实景三维模型从常用OSGB格式转化为便于编辑的...实景三维模型在铁路工程勘察设计方面应用愈发广泛,但在模型可视化过程中的失真现象和纹理贴图被倾斜摄影测量外业环境限制问题较为突出,严重制约实景三维模型的实际效果和应用范围。通过将实景三维模型从常用OSGB格式转化为便于编辑的OBJ格式,并在其数据框架内新建PBR(Physically Based Rendering)材质,以提升模型整体的真实度,最终在OSG(Open Scene Graph)内完成可视化渲染;过程中提出融合实拍照片优化PBR材质的参数设定和按地物材质特性分类的方法来进一步提升实景三维模型的纹理效果;分析OSG引擎内光照模型,选择最匹配铁路工程实际情况和当天作业条件的光照模型应用,在不改变已有数据结构的基础上,突破倾斜摄影作业环境对实景三维模型最终可视化成果质量的桎梏。该方法在既有铁路工程不同部位的实景三维模型上进行验证,结果表明,该技术可有效提升实景三维模型的可视化效果及表达真实度,具备一定的推广应用价值。展开更多
[Objective] The paper aims to provide references to cultivate I.galbana in a large scale and explore its medical value.[Method] I.galbana had been cultivated in different light-path flat plate bioreactors,and the grow...[Objective] The paper aims to provide references to cultivate I.galbana in a large scale and explore its medical value.[Method] I.galbana had been cultivated in different light-path flat plate bioreactors,and the growth condition and content of organic matter within cells of I.galbana had been analyzed.[Result] Growth rate and volumetric productivity of I.galbana cells increased as light-path of flat plate bioreactors decreased,however,daily areal output rate rose with the increasing of light path.The smaller the light path of flat plate bioreactors was,the more content of total lipids,protein and polysaccharide it had in I.galbana cells.[Conclusion] It is an effective way to improve production efficiently and reduce the cost by selecting the suitable bioreactors.展开更多
文摘实景三维模型在铁路工程勘察设计方面应用愈发广泛,但在模型可视化过程中的失真现象和纹理贴图被倾斜摄影测量外业环境限制问题较为突出,严重制约实景三维模型的实际效果和应用范围。通过将实景三维模型从常用OSGB格式转化为便于编辑的OBJ格式,并在其数据框架内新建PBR(Physically Based Rendering)材质,以提升模型整体的真实度,最终在OSG(Open Scene Graph)内完成可视化渲染;过程中提出融合实拍照片优化PBR材质的参数设定和按地物材质特性分类的方法来进一步提升实景三维模型的纹理效果;分析OSG引擎内光照模型,选择最匹配铁路工程实际情况和当天作业条件的光照模型应用,在不改变已有数据结构的基础上,突破倾斜摄影作业环境对实景三维模型最终可视化成果质量的桎梏。该方法在既有铁路工程不同部位的实景三维模型上进行验证,结果表明,该技术可有效提升实景三维模型的可视化效果及表达真实度,具备一定的推广应用价值。
基金Supported by National Ministry of Science and Technology Marine‘863’Marine Life Technology Plan Project(2008AA09Z403)Shangdong High School Technological Plan Project(J05I03)~~
文摘[Objective] The paper aims to provide references to cultivate I.galbana in a large scale and explore its medical value.[Method] I.galbana had been cultivated in different light-path flat plate bioreactors,and the growth condition and content of organic matter within cells of I.galbana had been analyzed.[Result] Growth rate and volumetric productivity of I.galbana cells increased as light-path of flat plate bioreactors decreased,however,daily areal output rate rose with the increasing of light path.The smaller the light path of flat plate bioreactors was,the more content of total lipids,protein and polysaccharide it had in I.galbana cells.[Conclusion] It is an effective way to improve production efficiently and reduce the cost by selecting the suitable bioreactors.
