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
The production of microalgae in laboratory systems is restricted almost exclusively since 500 mL to 20 liters tanks of transparent materials such as glass and plastic, under fluorescent lamps on shelves. In this work ...The production of microalgae in laboratory systems is restricted almost exclusively since 500 mL to 20 liters tanks of transparent materials such as glass and plastic, under fluorescent lamps on shelves. In this work we developed a laboratory system which produced up to 50 liters of micro- algae cultivation with comparable productivity to the traditional system in the laboratory, with the potential to increase productivity scale and lower energy consumption per produced volume. The system is built with opaque plastic tank, and illuminated by Plastic Optics Fiber (POF) and LED. The quality of the biomass grown in the culture system on LED is comparable to the tradi- tional cultivation, with scale-up without increasing the occupied area, only with increased height of the tank. The productivity of the tank on LED to the strain Scenedesmus sp. with a phototrophic cultivation reached productivity of around 20 mg•L<sup>–</sup>1•d<sup>–</sup>1 and continuing studies may increase further.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。
文摘The production of microalgae in laboratory systems is restricted almost exclusively since 500 mL to 20 liters tanks of transparent materials such as glass and plastic, under fluorescent lamps on shelves. In this work we developed a laboratory system which produced up to 50 liters of micro- algae cultivation with comparable productivity to the traditional system in the laboratory, with the potential to increase productivity scale and lower energy consumption per produced volume. The system is built with opaque plastic tank, and illuminated by Plastic Optics Fiber (POF) and LED. The quality of the biomass grown in the culture system on LED is comparable to the tradi- tional cultivation, with scale-up without increasing the occupied area, only with increased height of the tank. The productivity of the tank on LED to the strain Scenedesmus sp. with a phototrophic cultivation reached productivity of around 20 mg•L<sup>–</sup>1•d<sup>–</sup>1 and continuing studies may increase further.
